diff --git a/.npmignore b/.npmignore
new file mode 100644
index 0000000..22a826d
--- /dev/null
+++ b/.npmignore
@@ -0,0 +1,5 @@
+scripts
+
+.idea
+.babelrc
+.eslint*
\ No newline at end of file
diff --git a/README.md b/README.md
index 5eab5bd..f6605ee 100644
--- a/README.md
+++ b/README.md
@@ -154,9 +154,13 @@ You may instantiate the `Varshni3` class as follows:
 let varshni = new potprox.Varshni3({d0: 0.0368, r0: 5.389, b: 0.0597});
 ```
 
-### Potential class methods
+### Potential class members
 
-All the classes in the `potprox` object have a few common methods listed below.
+All the classes in the `potprox` object have a few members listed below.
+
+#### `type`
+
+The *static* read-only property containing the name of the potential class (e.g. `"LennardJones"`, `"Morse"`, `"Buckingham"` etc.).
 
 #### `from(data [, settings])`
 
diff --git a/dist/potprox.js b/dist/potprox.js
index 7cd8877..d015983 100644
--- a/dist/potprox.js
+++ b/dist/potprox.js
@@ -1,3 +1,5 @@
+// potprox v0.5.1
+// https://amphiluke.github.io/potprox/
 (function(f){if(typeof exports==="object"&&typeof module!=="undefined"){module.exports=f()}else if(typeof define==="function"&&define.amd){define([],f)}else{var g;if(typeof window!=="undefined"){g=window}else if(typeof global!=="undefined"){g=global}else if(typeof self!=="undefined"){g=self}else{g=this}g.potprox = f()}})(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
 let instanceData = new WeakMap();
 
@@ -9,6 +11,17 @@ class Buckingham {
         this.a = a;
     }
 
+    /**
+     * The name of the potential class. To be used instead of
+     * `instance.constructor.name` (since in the minified version names are mangled)
+     * @type {String}
+     * @readonly
+     * @static
+     */
+    static get type() {
+        return "Buckingham";
+    }
+
     /**
      * Create an instance of the Buckingham potential via approximation of input data.
      * This method performs fast initial approximation and is not very accurate.
@@ -173,7 +186,7 @@ class Buckingham {
     }
 
     toJSON() {
-        return {type: "Buckingham", d0: this.d0, r0: this.r0, a: this.a};
+        return {type: Buckingham.type, d0: this.d0, r0: this.r0, a: this.a};
     }
 }
 
@@ -188,6 +201,17 @@ class LennardJones {
         this.sigma = sigma;
     }
 
+    /**
+     * The name of the potential class. To be used instead of
+     * `instance.constructor.name` (since in the minified version names are mangled)
+     * @type {String}
+     * @readonly
+     * @static
+     */
+    static get type() {
+        return "LennardJones";
+    }
+
     /**
      * Create an instance of the Lennard-Jones potential via approximation of input data
      * @param {Array.<{r: Number, e: Number}>} data - Coordinates for approximation
@@ -242,6 +266,13 @@ class LennardJones {
         instanceData.get(this).sigma = value;
     }
 
+    get r0() {
+        return 1.122462048309373 * this.sigma;
+    }
+    set r0(value) {
+        this.sigma = value / 1.122462048309373;
+    }
+
     /**
      * Calculate the energy for the given interatomic distance
      * @param {Number} r
@@ -259,7 +290,7 @@ class LennardJones {
     }
 
     toJSON() {
-        return {type: "LennardJones", epsilon: this.epsilon, sigma: this.sigma};
+        return {type: LennardJones.type, epsilon: this.epsilon, sigma: this.sigma};
     }
 }
 
@@ -275,6 +306,17 @@ class Morse {
         this.a = a;
     }
 
+    /**
+     * The name of the potential class. To be used instead of
+     * `instance.constructor.name` (since in the minified version names are mangled)
+     * @type {String}
+     * @readonly
+     * @static
+     */
+    static get type() {
+        return "Morse";
+    }
+
     /**
      * Create an instance of the Morse potential via approximation of input data.
      * This method performs fast initial approximation and is not very accurate.
@@ -433,7 +475,7 @@ class Morse {
     }
 
     toJSON() {
-        return {type: "Morse", d0: this.d0, r0: this.r0, a: this.a};
+        return {type: Morse.type, d0: this.d0, r0: this.r0, a: this.a};
     }
 }
 
@@ -449,6 +491,17 @@ class Rydberg {
         this.b = b;
     }
 
+    /**
+     * The name of the potential class. To be used instead of
+     * `instance.constructor.name` (since in the minified version names are mangled)
+     * @type {String}
+     * @readonly
+     * @static
+     */
+    static get type() {
+        return "Rydberg";
+    }
+
     /**
      * Create an instance of the Rydberg potential via approximation of input data.
      * This method performs fast initial approximation and is not very accurate.
@@ -608,7 +661,7 @@ class Rydberg {
     }
 
     toJSON() {
-        return {type: "Rydberg", d0: this.d0, r0: this.r0, b: this.b};
+        return {type: Rydberg.type, d0: this.d0, r0: this.r0, b: this.b};
     }
 }
 
@@ -624,6 +677,17 @@ class Varshni3 {
         this.b = b;
     }
 
+    /**
+     * The name of the potential class. To be used instead of
+     * `instance.constructor.name` (since in the minified version names are mangled)
+     * @type {String}
+     * @readonly
+     * @static
+     */
+    static get type() {
+        return "Varshni3";
+    }
+
     /**
      * Create an instance of the Varshni potential (III) via approximation of input data.
      * This method performs fast initial approximation and is not very accurate.
@@ -782,19 +846,23 @@ class Varshni3 {
     }
 
     toJSON() {
-        return {type: "Varshni3", d0: this.d0, r0: this.r0, b: this.b};
+        return {type: Varshni3.type, d0: this.d0, r0: this.r0, b: this.b};
     }
 }
 
 module.exports = Varshni3;
 },{}],6:[function(require,module,exports){
-let potprox = {
-    LennardJones: require("./potentials/lennard-jones.js"),
-    Buckingham: require("./potentials/buckingham.js"),
-    Morse: require("./potentials/morse.js"),
-    Rydberg: require("./potentials/rydberg.js"),
-    Varshni3: require("./potentials/varshni3.js")
-};
+let potentialClasses = [
+    require("./potentials/lennard-jones.js"),
+    require("./potentials/buckingham.js"),
+    require("./potentials/morse.js"),
+    require("./potentials/rydberg.js"),
+    require("./potentials/varshni3.js")
+];
+
+let potprox = Object.create(null);
+
+potentialClasses.forEach(potentialClass => potprox[potentialClass.type] = potentialClass);
 
 // Other properties of the potprox object are non-enumerable to avoid mixing them with
 // potential classes when using such methods as Object.keys, Object.values etc.
diff --git a/dist/potprox.min.js b/dist/potprox.min.js
index 16c5d48..ca8bc2e 100644
--- a/dist/potprox.min.js
+++ b/dist/potprox.min.js
@@ -1 +1,3 @@
-(function(a){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=a();else if("function"==typeof define&&define.amd)define([],a);else{var b;b="undefined"==typeof window?"undefined"==typeof global?"undefined"==typeof self?this:self:global:window,b.potprox=a()}})(function(){return function b(c,d,e){function a(h,i){if(!d[h]){if(!c[h]){var j="function"==typeof require&&require;if(!i&&j)return j(h,!0);if(g)return g(h,!0);var k=new Error("Cannot find module '"+h+"'");throw k.code="MODULE_NOT_FOUND",k}var f=d[h]={exports:{}};c[h][0].call(f.exports,function(b){var d=c[h][1][b];return a(d?d:b)},f,f.exports,b,c,d,e)}return d[h].exports}for(var g="function"==typeof require&&require,f=0;f<e.length;f++)a(e[f]);return a}({1:[function(a,b){let c=new WeakMap;class d{constructor({d0:b=1,r0:d=1,a:e=2}={}){c.set(this,{}),this.d0=b,this.r0=d,this.a=e}static fastFrom(b){if(!Array.isArray(b))throw new TypeError("Approximated data should be an array of points");if(3>b.length)throw new Error("Too little points. Approximation is impossible");b=b.slice().sort((a,b)=>a.r-b.r);let c=Number.POSITIVE_INFINITY,f=1;for(let{r:a,e:d}of b)d<c&&(c=d,f=a);c=Math.abs(c);let e,g;for(let a=1;a<b.length&&(e=b[a-1],g=b[a],!(g.r>=f||0>e.e||0>g.e));a++);let h;if(e&&g&&e.r<f&&g.r<=f){let a=e.e*(e.r-g.r)/(g.e-e.e)+e.r;if(0<a){let b=1-a/f,c=Math.pow(f/a,6)/6;h=(c-b-Math.sqrt(c*c-2*b*c-b*b))/(b*b),Number.isFinite(h)||(h=void 0)}}return new d({d0:c,r0:f,a:h})}static from(b,{d0Conv:c=1e-3,r0Conv:d=1e-3,aConv:e=1e-3}={}){let f=this.fastFrom(b),{d0:g,r0:h,a:i}=f;const a=g*c,j=h*d,k=i*e;let l,m,n;do{let a=0,c=0,d=0,f=0,j=0,o=0,p=0,q=0,s=0;for(let{r:t,e:r}of b){let b=i*Math.pow(h/t,6),e=Math.exp(i*(1-t/h)),u=g/(i-6)*(6*e-b),k=u/g,l=g/(i-6)*(6*e*i*t/(h*h)-6*b/h),m=-g/((i-6)*(i-6))*(6*e-b)+g/(i-6)*(6*(1-t/h)*e-b/i);a+=k*k,c+=l*k,d+=m*k,f+=(u-r)*k,j+=l*l,o+=m*l,p+=(u-r)*l,q+=m*m,s+=(u-r)*m}n=-(f-a*p/c-(f-a*s/d)*((c-a*j/c)/(c-a*o/d)))/(d-a*o/c-(d-a*q/d)*(c-a*j/c)/(c-a*o/d)),m=((d-a*o/c)*n+(f-a*p/c))/(a*j/c-c),l=(-c*m-d*n-f)/a,g+=l,h+=m,i+=n}while(Math.abs(l)>a&&Math.abs(m)>j&&Math.abs(n)>k);return f.d0=g,f.r0=h,f.a=i,f}get d0(){return c.get(this).d0}set d0(a){if(!Number.isFinite(a))throw new TypeError("The 'd0' parameter should be a finite number");if(0>=a)throw new RangeError("The 'd0' parameter should be greater than zero");c.get(this).d0=a}get r0(){return c.get(this).r0}set r0(a){if(!Number.isFinite(a))throw new TypeError("The 'r0' parameter should be a finite number");if(0>=a)throw new RangeError("The 'r0' parameter should be greater than zero");c.get(this).r0=a}get a(){return c.get(this).a}set a(a){if(!Number.isFinite(a))throw new TypeError("The 'a' parameter should be a finite number");if(0>=a)throw new RangeError("The 'a' parameter should be greater than 0");c.get(this).a=a}at(b){if("number"!=typeof b)throw new TypeError("Distance should be a number");if(0>b)throw new RangeError("Distance shouldn't be less than zero");let{d0:c,r0:d,a:e}=this;return c/(e-6)*(6*Math.exp(e*(1-b/d))-e*Math.pow(d/b,6))}toJSON(){return{type:"Buckingham",d0:this.d0,r0:this.r0,a:this.a}}}b.exports=d},{}],2:[function(a,b){let c=new WeakMap;class d{constructor({epsilon:a=1,sigma:b=1}={}){c.set(this,{}),this.epsilon=a,this.sigma=b}static from(c){if(!Array.isArray(c))throw new TypeError("Approximated data should be an array of points");if(3>c.length)throw new Error("Too little points. Approximation is impossible");let f=0,g=0,h=0,i=0,j=0;for(let{r:a,e:b}of c)f+=Math.pow(a,-24),g+=Math.pow(a,-18),h+=b*Math.pow(a,-12),i+=Math.pow(a,-12),j+=b*Math.pow(a,-6);let e=(j-g*h/f)/(i-g*g/f),b=(h-g*e)/f,k=Math.pow(-b/e,1/6),l=b/(4*Math.pow(k,12));return new d({epsilon:l,sigma:k})}get epsilon(){return c.get(this).epsilon}set epsilon(a){if(!Number.isFinite(a))throw new TypeError("The 'epsilon' parameter should be a finite number");if(0>=a)throw new RangeError("The 'epsilon' parameter should be greater than zero");c.get(this).epsilon=a}get sigma(){return c.get(this).sigma}set sigma(a){if(!Number.isFinite(a))throw new TypeError("The 'sigma' parameter should be a finite number");if(0>=a)throw new RangeError("The 'sigma' parameter should be greater than zero");c.get(this).sigma=a}at(a){if("number"!=typeof a)throw new TypeError("Distance should be a number");if(0>a)throw new RangeError("Distance shouldn't be less than zero");let{epsilon:b,sigma:c}=this;return 4*b*(Math.pow(c/a,12)-Math.pow(c/a,6))}toJSON(){return{type:"LennardJones",epsilon:this.epsilon,sigma:this.sigma}}}b.exports=d},{}],3:[function(a,b){let c=new WeakMap;class d{constructor({d0:b=1,r0:d=1,a:e=1}={}){c.set(this,{}),this.d0=b,this.r0=d,this.a=e}static fastFrom(b){if(!Array.isArray(b))throw new TypeError("Approximated data should be an array of points");if(3>b.length)throw new Error("Too little points. Approximation is impossible");let c=Number.POSITIVE_INFINITY,f=1;for(let{r:a,e:d}of b)d<c&&(c=d,f=a);c=Math.abs(c);let g=0,h=0;for(let{r:a,e:d}of b){let b=Math.sqrt(1+d/c),e=Number.NaN;a>f?e=Math.log(1-b)/(f-a):a<f&&(e=Math.log(1+b)/(f-a)),Number.isFinite(e)&&(g+=e,h++)}return g/=h,new d({d0:c,r0:f,a:g})}static from(b,{d0Conv:c=1e-3,r0Conv:d=1e-3,aConv:e=1e-3}={}){let f=this.fastFrom(b),{d0:g,r0:h,a:i}=f;const a=g*c,j=h*d,k=i*e;let l,m,n;do{let a=0,c=0,d=0,f=0,j=0,o=0,p=0,q=0,s=0;for(let{r:t,e:r}of b){let b=Math.exp(i*(h-t)),e=-g+g*(1-b)*(1-b),k=e/g,l=-2*g*(1-b)*i*b,m=2*g*(1-b)*(t-h)*b;a+=k*k,c+=l*k,d+=m*k,f+=(e-r)*k,j+=l*l,o+=m*l,p+=(e-r)*l,q+=m*m,s+=(e-r)*m}n=-(f-a*p/c-(f-a*s/d)*((c-a*j/c)/(c-a*o/d)))/(d-a*o/c-(d-a*q/d)*(c-a*j/c)/(c-a*o/d)),m=((d-a*o/c)*n+(f-a*p/c))/(a*j/c-c),l=(-c*m-d*n-f)/a,g+=l,h+=m,i+=n}while(Math.abs(l)>a&&Math.abs(m)>j&&Math.abs(n)>k);return f.d0=g,f.r0=h,f.a=i,f}get d0(){return c.get(this).d0}set d0(a){if(!Number.isFinite(a))throw new TypeError("The 'd0' parameter should be a finite number");if(0>=a)throw new RangeError("The 'd0' parameter should be greater than zero");c.get(this).d0=a}get r0(){return c.get(this).r0}set r0(a){if(!Number.isFinite(a))throw new TypeError("The 'r0' parameter should be a finite number");if(0>=a)throw new RangeError("The 'r0' parameter should be greater than zero");c.get(this).r0=a}get a(){return c.get(this).a}set a(a){if(!Number.isFinite(a))throw new TypeError("The 'a' parameter should be a finite number");if(0>=a)throw new RangeError("The 'a' parameter should be greater than zero");c.get(this).a=a}at(b){if("number"!=typeof b)throw new TypeError("Distance should be a number");if(0>b)throw new RangeError("Distance shouldn't be less than zero");let{d0:c,r0:d,a:e}=this,a=1-Math.exp(e*(d-b));return c*a*a-c}toJSON(){return{type:"Morse",d0:this.d0,r0:this.r0,a:this.a}}}b.exports=d},{}],4:[function(a,b){let c=new WeakMap;class d{constructor({d0:a=1,r0:d=1,b:e=2}={}){c.set(this,{}),this.d0=a,this.r0=d,this.b=e}static fastFrom(a){if(!Array.isArray(a))throw new TypeError("Approximated data should be an array of points");if(3>a.length)throw new Error("Too little points. Approximation is impossible");a=a.slice().sort((a,b)=>a.r-b.r);let c=Number.POSITIVE_INFINITY,f=1;for(let{r:b,e:d}of a)d<c&&(c=d,f=b);c=Math.abs(c);let e,g;for(let b=1;b<a.length&&(e=a[b-1],g=a[b],!(g.r>=f||0>e.e||0>g.e));b++);let h;if(e&&g&&e.r<f&&g.r<=f){let a=e.e*(e.r-g.r)/(g.e-e.e)+e.r;0<a&&(h=f/(f-a))}return new d({d0:c,r0:f,b:h})}static from(a,{d0Conv:c=1e-3,r0Conv:d=1e-3,bConv:e=1e-3}={}){let f=this.fastFrom(a),{d0:g,r0:h,b:i}=f;const b=g*c,j=h*d,k=i*e;let l,m,n;do{let b=0,c=0,d=0,f=0,j=0,o=0,p=0,q=0,s=0;for(let{r:t,e:r}of a){let a=i*(t/h-1),e=Math.exp(-a),u=-g*(1+a)*e,k=u/g,l=-g*i*t/(h*h)*e*a,m=g*a/i*e*a;b+=k*k,c+=l*k,d+=m*k,f+=(u-r)*k,j+=l*l,o+=m*l,p+=(u-r)*l,q+=m*m,s+=(u-r)*m}n=-(f-b*p/c-(f-b*s/d)*((c-b*j/c)/(c-b*o/d)))/(d-b*o/c-(d-b*q/d)*(c-b*j/c)/(c-b*o/d)),m=((d-b*o/c)*n+(f-b*p/c))/(b*j/c-c),l=(-c*m-d*n-f)/b,g+=l,h+=m,i+=n}while(Math.abs(l)>b&&Math.abs(m)>j&&Math.abs(n)>k);return f.d0=g,f.r0=h,f.b=i,f}get d0(){return c.get(this).d0}set d0(a){if(!Number.isFinite(a))throw new TypeError("The 'd0' parameter should be a finite number");if(0>=a)throw new RangeError("The 'd0' parameter should be greater than zero");c.get(this).d0=a}get r0(){return c.get(this).r0}set r0(a){if(!Number.isFinite(a))throw new TypeError("The 'r0' parameter should be a finite number");if(0>=a)throw new RangeError("The 'r0' parameter should be greater than zero");c.get(this).r0=a}get b(){return c.get(this).b}set b(a){if(!Number.isFinite(a))throw new TypeError("The 'b' parameter should be a finite number");if(1>=a)throw new RangeError("The 'b' parameter should be greater than 1");c.get(this).b=a}at(a){if("number"!=typeof a)throw new TypeError("Distance should be a number");if(0>a)throw new RangeError("Distance shouldn't be less than zero");let{d0:c,r0:d,b:e}=this,b=e*(a-d)/d;return-c*(1+b)*Math.exp(-b)}toJSON(){return{type:"Rydberg",d0:this.d0,r0:this.r0,b:this.b}}}b.exports=d},{}],5:[function(a,b){let c=new WeakMap;class d{constructor({d0:a=1,r0:d=1,b:e=1}={}){c.set(this,{}),this.d0=a,this.r0=d,this.b=e}static fastFrom(a){if(!Array.isArray(a))throw new TypeError("Approximated data should be an array of points");if(3>a.length)throw new Error("Too little points. Approximation is impossible");let c=Number.POSITIVE_INFINITY,f=1;for(let{r:b,e:d}of a)d<c&&(c=d,f=b);c=Math.abs(c);let g=0,h=0;for(let{r:b,e:d}of a){let a=Math.sqrt(1+d/c),e=Number.NaN;b>f?e=Math.log(b/f*(1-a))/(f*f-b*b):b<f&&(e=Math.log(b/f*(1+a))/(f*f-b*b)),Number.isFinite(e)&&(g+=e,h++)}return g/=h,new d({d0:c,r0:f,b:g})}static from(a,{d0Conv:c=1e-3,r0Conv:d=1e-3,bConv:e=1e-3}={}){let f=this.fastFrom(a),{d0:g,r0:h,b:i}=f;const b=g*c,j=h*d,k=i*e;let l,m,n;do{let b=0,c=0,d=0,f=0,j=0,o=0,p=0,q=0,s=0;for(let{r:t,e:r}of a){let a=h/t*Math.exp(i*(h*h-t*t)),e=-g+g*(1-a)*(1-a),k=e/g,l=2*g*(1-a)*(-a/h-2*a*i*h),m=2*g*(1-a)*a*(t*t-h*h);b+=k*k,c+=l*k,d+=m*k,f+=(e-r)*k,j+=l*l,o+=m*l,p+=(e-r)*l,q+=m*m,s+=(e-r)*m}n=-(f-b*p/c-(f-b*s/d)*((c-b*j/c)/(c-b*o/d)))/(d-b*o/c-(d-b*q/d)*(c-b*j/c)/(c-b*o/d)),m=((d-b*o/c)*n+(f-b*p/c))/(b*j/c-c),l=(-c*m-d*n-f)/b,g+=l,h+=m,i+=n}while(Math.abs(l)>b&&Math.abs(m)>j&&Math.abs(n)>k);return f.d0=g,f.r0=h,f.b=i,f}get d0(){return c.get(this).d0}set d0(a){if(!Number.isFinite(a))throw new TypeError("The 'd0' parameter should be a finite number");if(0>=a)throw new RangeError("The 'd0' parameter should be greater than zero");c.get(this).d0=a}get r0(){return c.get(this).r0}set r0(a){if(!Number.isFinite(a))throw new TypeError("The 'r0' parameter should be a finite number");if(0>=a)throw new RangeError("The 'r0' parameter should be greater than zero");c.get(this).r0=a}get b(){return c.get(this).b}set b(a){if(!Number.isFinite(a))throw new TypeError("The 'b' parameter should be a finite number");if(0>=a)throw new RangeError("The 'b' parameter should be greater than zero");c.get(this).b=a}at(a){if("number"!=typeof a)throw new TypeError("Distance should be a number");if(0>a)throw new RangeError("Distance shouldn't be less than zero");let{d0:c,r0:d,b:e}=this,b=1-d/a*Math.exp(e*(d*d-a*a));return c*b*b-c}toJSON(){return{type:"Varshni3",d0:this.d0,r0:this.r0,b:this.b}}}b.exports=d},{}],6:[function(a,b){let c={LennardJones:a("./potentials/lennard-jones.js"),Buckingham:a("./potentials/buckingham.js"),Morse:a("./potentials/morse.js"),Rydberg:a("./potentials/rydberg.js"),Varshni3:a("./potentials/varshni3.js")};Object.defineProperty(c,"utils",{configurable:!0,value:a("./utils.js")}),b.exports=c},{"./potentials/buckingham.js":1,"./potentials/lennard-jones.js":2,"./potentials/morse.js":3,"./potentials/rydberg.js":4,"./potentials/varshni3.js":5,"./utils.js":7}],7:[function(a,b){b.exports={rSqr(a,b){let c=0,d=0;for(let{r:f,e:g}of a){c+=g;let a=g-b.at(f);d+=a*a}c/=a.length;let f=0;for(let{e:d}of a){let a=d-c;f+=a*a}return 1-d/f}}},{}]},{},[6])(6)});
+// potprox v0.5.1
+// https://amphiluke.github.io/potprox/
+(function(a){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=a();else if("function"==typeof define&&define.amd)define([],a);else{var b;b="undefined"==typeof window?"undefined"==typeof global?"undefined"==typeof self?this:self:global:window,b.potprox=a()}})(function(){return function b(c,d,e){function a(h,i){if(!d[h]){if(!c[h]){var j="function"==typeof require&&require;if(!i&&j)return j(h,!0);if(g)return g(h,!0);var k=new Error("Cannot find module '"+h+"'");throw k.code="MODULE_NOT_FOUND",k}var f=d[h]={exports:{}};c[h][0].call(f.exports,function(b){var d=c[h][1][b];return a(d?d:b)},f,f.exports,b,c,d,e)}return d[h].exports}for(var g="function"==typeof require&&require,f=0;f<e.length;f++)a(e[f]);return a}({1:[function(a,b){let c=new WeakMap;class d{constructor({d0:b=1,r0:d=1,a:e=2}={}){c.set(this,{}),this.d0=b,this.r0=d,this.a=e}static get type(){return"Buckingham"}static fastFrom(b){if(!Array.isArray(b))throw new TypeError("Approximated data should be an array of points");if(3>b.length)throw new Error("Too little points. Approximation is impossible");b=b.slice().sort((a,b)=>a.r-b.r);let c=Number.POSITIVE_INFINITY,f=1;for(let{r:a,e:d}of b)d<c&&(c=d,f=a);c=Math.abs(c);let e,g;for(let a=1;a<b.length&&(e=b[a-1],g=b[a],!(g.r>=f||0>e.e||0>g.e));a++);let h;if(e&&g&&e.r<f&&g.r<=f){let a=e.e*(e.r-g.r)/(g.e-e.e)+e.r;if(0<a){let b=1-a/f,c=Math.pow(f/a,6)/6;h=(c-b-Math.sqrt(c*c-2*b*c-b*b))/(b*b),Number.isFinite(h)||(h=void 0)}}return new d({d0:c,r0:f,a:h})}static from(b,{d0Conv:c=1e-3,r0Conv:d=1e-3,aConv:e=1e-3}={}){let f=this.fastFrom(b),{d0:g,r0:h,a:i}=f;const a=g*c,j=h*d,k=i*e;let l,m,n;do{let a=0,c=0,d=0,f=0,j=0,o=0,p=0,q=0,s=0;for(let{r:t,e:r}of b){let b=i*Math.pow(h/t,6),e=Math.exp(i*(1-t/h)),u=g/(i-6)*(6*e-b),k=u/g,l=g/(i-6)*(6*e*i*t/(h*h)-6*b/h),m=-g/((i-6)*(i-6))*(6*e-b)+g/(i-6)*(6*(1-t/h)*e-b/i);a+=k*k,c+=l*k,d+=m*k,f+=(u-r)*k,j+=l*l,o+=m*l,p+=(u-r)*l,q+=m*m,s+=(u-r)*m}n=-(f-a*p/c-(f-a*s/d)*((c-a*j/c)/(c-a*o/d)))/(d-a*o/c-(d-a*q/d)*(c-a*j/c)/(c-a*o/d)),m=((d-a*o/c)*n+(f-a*p/c))/(a*j/c-c),l=(-c*m-d*n-f)/a,g+=l,h+=m,i+=n}while(Math.abs(l)>a&&Math.abs(m)>j&&Math.abs(n)>k);return f.d0=g,f.r0=h,f.a=i,f}get d0(){return c.get(this).d0}set d0(a){if(!Number.isFinite(a))throw new TypeError("The 'd0' parameter should be a finite number");if(0>=a)throw new RangeError("The 'd0' parameter should be greater than zero");c.get(this).d0=a}get r0(){return c.get(this).r0}set r0(a){if(!Number.isFinite(a))throw new TypeError("The 'r0' parameter should be a finite number");if(0>=a)throw new RangeError("The 'r0' parameter should be greater than zero");c.get(this).r0=a}get a(){return c.get(this).a}set a(a){if(!Number.isFinite(a))throw new TypeError("The 'a' parameter should be a finite number");if(0>=a)throw new RangeError("The 'a' parameter should be greater than 0");c.get(this).a=a}at(b){if("number"!=typeof b)throw new TypeError("Distance should be a number");if(0>b)throw new RangeError("Distance shouldn't be less than zero");let{d0:c,r0:d,a:e}=this;return c/(e-6)*(6*Math.exp(e*(1-b/d))-e*Math.pow(d/b,6))}toJSON(){return{type:d.type,d0:this.d0,r0:this.r0,a:this.a}}}b.exports=d},{}],2:[function(a,b){let c=new WeakMap;class d{constructor({epsilon:a=1,sigma:b=1}={}){c.set(this,{}),this.epsilon=a,this.sigma=b}static get type(){return"LennardJones"}static from(c){if(!Array.isArray(c))throw new TypeError("Approximated data should be an array of points");if(3>c.length)throw new Error("Too little points. Approximation is impossible");let f=0,g=0,h=0,i=0,j=0;for(let{r:a,e:b}of c)f+=Math.pow(a,-24),g+=Math.pow(a,-18),h+=b*Math.pow(a,-12),i+=Math.pow(a,-12),j+=b*Math.pow(a,-6);let e=(j-g*h/f)/(i-g*g/f),b=(h-g*e)/f,k=Math.pow(-b/e,1/6),l=b/(4*Math.pow(k,12));return new d({epsilon:l,sigma:k})}get epsilon(){return c.get(this).epsilon}set epsilon(a){if(!Number.isFinite(a))throw new TypeError("The 'epsilon' parameter should be a finite number");if(0>=a)throw new RangeError("The 'epsilon' parameter should be greater than zero");c.get(this).epsilon=a}get sigma(){return c.get(this).sigma}set sigma(a){if(!Number.isFinite(a))throw new TypeError("The 'sigma' parameter should be a finite number");if(0>=a)throw new RangeError("The 'sigma' parameter should be greater than zero");c.get(this).sigma=a}get r0(){return 1.122462048309373*this.sigma}set r0(a){this.sigma=a/1.122462048309373}at(a){if("number"!=typeof a)throw new TypeError("Distance should be a number");if(0>a)throw new RangeError("Distance shouldn't be less than zero");let{epsilon:b,sigma:c}=this;return 4*b*(Math.pow(c/a,12)-Math.pow(c/a,6))}toJSON(){return{type:d.type,epsilon:this.epsilon,sigma:this.sigma}}}b.exports=d},{}],3:[function(a,b){let c=new WeakMap;class d{constructor({d0:b=1,r0:d=1,a:e=1}={}){c.set(this,{}),this.d0=b,this.r0=d,this.a=e}static get type(){return"Morse"}static fastFrom(b){if(!Array.isArray(b))throw new TypeError("Approximated data should be an array of points");if(3>b.length)throw new Error("Too little points. Approximation is impossible");let c=Number.POSITIVE_INFINITY,f=1;for(let{r:a,e:d}of b)d<c&&(c=d,f=a);c=Math.abs(c);let g=0,h=0;for(let{r:a,e:d}of b){let b=Math.sqrt(1+d/c),e=Number.NaN;a>f?e=Math.log(1-b)/(f-a):a<f&&(e=Math.log(1+b)/(f-a)),Number.isFinite(e)&&(g+=e,h++)}return g/=h,new d({d0:c,r0:f,a:g})}static from(b,{d0Conv:c=1e-3,r0Conv:d=1e-3,aConv:e=1e-3}={}){let f=this.fastFrom(b),{d0:g,r0:h,a:i}=f;const a=g*c,j=h*d,k=i*e;let l,m,n;do{let a=0,c=0,d=0,f=0,j=0,o=0,p=0,q=0,s=0;for(let{r:t,e:r}of b){let b=Math.exp(i*(h-t)),e=-g+g*(1-b)*(1-b),k=e/g,l=-2*g*(1-b)*i*b,m=2*g*(1-b)*(t-h)*b;a+=k*k,c+=l*k,d+=m*k,f+=(e-r)*k,j+=l*l,o+=m*l,p+=(e-r)*l,q+=m*m,s+=(e-r)*m}n=-(f-a*p/c-(f-a*s/d)*((c-a*j/c)/(c-a*o/d)))/(d-a*o/c-(d-a*q/d)*(c-a*j/c)/(c-a*o/d)),m=((d-a*o/c)*n+(f-a*p/c))/(a*j/c-c),l=(-c*m-d*n-f)/a,g+=l,h+=m,i+=n}while(Math.abs(l)>a&&Math.abs(m)>j&&Math.abs(n)>k);return f.d0=g,f.r0=h,f.a=i,f}get d0(){return c.get(this).d0}set d0(a){if(!Number.isFinite(a))throw new TypeError("The 'd0' parameter should be a finite number");if(0>=a)throw new RangeError("The 'd0' parameter should be greater than zero");c.get(this).d0=a}get r0(){return c.get(this).r0}set r0(a){if(!Number.isFinite(a))throw new TypeError("The 'r0' parameter should be a finite number");if(0>=a)throw new RangeError("The 'r0' parameter should be greater than zero");c.get(this).r0=a}get a(){return c.get(this).a}set a(a){if(!Number.isFinite(a))throw new TypeError("The 'a' parameter should be a finite number");if(0>=a)throw new RangeError("The 'a' parameter should be greater than zero");c.get(this).a=a}at(b){if("number"!=typeof b)throw new TypeError("Distance should be a number");if(0>b)throw new RangeError("Distance shouldn't be less than zero");let{d0:c,r0:d,a:e}=this,a=1-Math.exp(e*(d-b));return c*a*a-c}toJSON(){return{type:d.type,d0:this.d0,r0:this.r0,a:this.a}}}b.exports=d},{}],4:[function(a,b){let c=new WeakMap;class d{constructor({d0:a=1,r0:d=1,b:e=2}={}){c.set(this,{}),this.d0=a,this.r0=d,this.b=e}static get type(){return"Rydberg"}static fastFrom(a){if(!Array.isArray(a))throw new TypeError("Approximated data should be an array of points");if(3>a.length)throw new Error("Too little points. Approximation is impossible");a=a.slice().sort((a,b)=>a.r-b.r);let c=Number.POSITIVE_INFINITY,f=1;for(let{r:b,e:d}of a)d<c&&(c=d,f=b);c=Math.abs(c);let e,g;for(let b=1;b<a.length&&(e=a[b-1],g=a[b],!(g.r>=f||0>e.e||0>g.e));b++);let h;if(e&&g&&e.r<f&&g.r<=f){let a=e.e*(e.r-g.r)/(g.e-e.e)+e.r;0<a&&(h=f/(f-a))}return new d({d0:c,r0:f,b:h})}static from(a,{d0Conv:c=1e-3,r0Conv:d=1e-3,bConv:e=1e-3}={}){let f=this.fastFrom(a),{d0:g,r0:h,b:i}=f;const b=g*c,j=h*d,k=i*e;let l,m,n;do{let b=0,c=0,d=0,f=0,j=0,o=0,p=0,q=0,s=0;for(let{r:t,e:r}of a){let a=i*(t/h-1),e=Math.exp(-a),u=-g*(1+a)*e,k=u/g,l=-g*i*t/(h*h)*e*a,m=g*a/i*e*a;b+=k*k,c+=l*k,d+=m*k,f+=(u-r)*k,j+=l*l,o+=m*l,p+=(u-r)*l,q+=m*m,s+=(u-r)*m}n=-(f-b*p/c-(f-b*s/d)*((c-b*j/c)/(c-b*o/d)))/(d-b*o/c-(d-b*q/d)*(c-b*j/c)/(c-b*o/d)),m=((d-b*o/c)*n+(f-b*p/c))/(b*j/c-c),l=(-c*m-d*n-f)/b,g+=l,h+=m,i+=n}while(Math.abs(l)>b&&Math.abs(m)>j&&Math.abs(n)>k);return f.d0=g,f.r0=h,f.b=i,f}get d0(){return c.get(this).d0}set d0(a){if(!Number.isFinite(a))throw new TypeError("The 'd0' parameter should be a finite number");if(0>=a)throw new RangeError("The 'd0' parameter should be greater than zero");c.get(this).d0=a}get r0(){return c.get(this).r0}set r0(a){if(!Number.isFinite(a))throw new TypeError("The 'r0' parameter should be a finite number");if(0>=a)throw new RangeError("The 'r0' parameter should be greater than zero");c.get(this).r0=a}get b(){return c.get(this).b}set b(a){if(!Number.isFinite(a))throw new TypeError("The 'b' parameter should be a finite number");if(1>=a)throw new RangeError("The 'b' parameter should be greater than 1");c.get(this).b=a}at(a){if("number"!=typeof a)throw new TypeError("Distance should be a number");if(0>a)throw new RangeError("Distance shouldn't be less than zero");let{d0:c,r0:d,b:e}=this,b=e*(a-d)/d;return-c*(1+b)*Math.exp(-b)}toJSON(){return{type:d.type,d0:this.d0,r0:this.r0,b:this.b}}}b.exports=d},{}],5:[function(a,b){let c=new WeakMap;class d{constructor({d0:a=1,r0:d=1,b:e=1}={}){c.set(this,{}),this.d0=a,this.r0=d,this.b=e}static get type(){return"Varshni3"}static fastFrom(a){if(!Array.isArray(a))throw new TypeError("Approximated data should be an array of points");if(3>a.length)throw new Error("Too little points. 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diff --git a/package-lock.json b/package-lock.json
index 92b1678..e4f603b 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
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+          "dev": true
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+          "resolved": "https://registry.npmjs.org/babel-core/-/babel-core-6.26.0.tgz",
+          "integrity": "sha1-rzL3izGm/O8RnIew/Y2XU/A6C7g=",
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+          "integrity": "sha1-btAhFz4vy0htestFxgCahW9kcHE=",
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+          "integrity": "sha1-RqnL1+3MYsjlwGTi0tjQ9ANXZu4=",
+          "dev": true
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+          "resolved": "https://registry.npmjs.org/babel-types/-/babel-types-6.26.0.tgz",
+          "integrity": "sha1-o7Bz+Uq0nrb6Vc1lInozQ4BjJJc=",
+          "dev": true
+        },
+        "babylon": {
+          "version": "6.18.0",
+          "resolved": "https://registry.npmjs.org/babylon/-/babylon-6.18.0.tgz",
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+          "dev": true
+        },
+        "regenerator-runtime": {
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+          "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.11.0.tgz",
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+          "dev": true
+        }
+      }
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@@ -169,16 +259,80 @@
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-      "integrity": "sha1-fdQrBGPHQunVKW3rPsZ6kyLa1yk=",
-      "dev": true
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-core/-/babel-core-6.26.0.tgz",
+      "integrity": "sha1-rzL3izGm/O8RnIew/Y2XU/A6C7g=",
+      "dev": true,
+      "dependencies": {
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+          "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
+          "integrity": "sha1-Y/1D99weO7fONZR9uP42mj9Yx0s=",
+          "dev": true
+        },
+        "babel-runtime": {
+          "version": "6.26.0",
+          "resolved": "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.26.0.tgz",
+          "integrity": "sha1-llxwWGaOgrVde/4E/yM3vItWR/4=",
+          "dev": true
+        },
+        "babel-template": {
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+          "resolved": "https://registry.npmjs.org/babel-template/-/babel-template-6.26.0.tgz",
+          "integrity": "sha1-3gPi0WOWsGn0bdn/+FIfsaDjXgI=",
+          "dev": true
+        },
+        "babel-traverse": {
+          "version": "6.26.0",
+          "resolved": "https://registry.npmjs.org/babel-traverse/-/babel-traverse-6.26.0.tgz",
+          "integrity": "sha1-RqnL1+3MYsjlwGTi0tjQ9ANXZu4=",
+          "dev": true
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+          "resolved": "https://registry.npmjs.org/babel-types/-/babel-types-6.26.0.tgz",
+          "integrity": "sha1-o7Bz+Uq0nrb6Vc1lInozQ4BjJJc=",
+          "dev": true
+        },
+        "babylon": {
+          "version": "6.18.0",
+          "resolved": "https://registry.npmjs.org/babylon/-/babylon-6.18.0.tgz",
+          "integrity": "sha512-q/UEjfGJ2Cm3oKV71DJz9d25TPnq5rhBVL2Q4fA5wcC3jcrdn7+SssEybFIxwAvvP+YCsCYNKughoF33GxgycQ==",
+          "dev": true
+        },
+        "regenerator-runtime": {
+          "version": "0.11.0",
+          "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.11.0.tgz",
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+          "dev": true
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+      }
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-      "version": "6.25.0",
-      "resolved": "https://registry.npmjs.org/babel-generator/-/babel-generator-6.25.0.tgz",
-      "integrity": "sha1-M6GvcNXyiQrrRlpKd5PB32qeqfw=",
-      "dev": true
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-generator/-/babel-generator-6.26.0.tgz",
+      "integrity": "sha1-rBriAHC3n248odMmlhMFN3TyDcU=",
+      "dev": true,
+      "dependencies": {
+        "babel-runtime": {
+          "version": "6.26.0",
+          "resolved": "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.26.0.tgz",
+          "integrity": "sha1-llxwWGaOgrVde/4E/yM3vItWR/4=",
+          "dev": true
+        },
+        "babel-types": {
+          "version": "6.26.0",
+          "resolved": "https://registry.npmjs.org/babel-types/-/babel-types-6.26.0.tgz",
+          "integrity": "sha1-o7Bz+Uq0nrb6Vc1lInozQ4BjJJc=",
+          "dev": true
+        },
+        "regenerator-runtime": {
+          "version": "0.11.0",
+          "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.11.0.tgz",
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+          "dev": true
+        }
+      }
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     "babel-helper-evaluate-path": {
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@@ -366,12 +520,6 @@
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@@ -379,10 +527,30 @@
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-      "integrity": "sha1-fhDhOi9xBlvfrVoXh7pFvKbe118=",
-      "dev": true
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-register/-/babel-register-6.26.0.tgz",
+      "integrity": "sha1-btAhFz4vy0htestFxgCahW9kcHE=",
+      "dev": true,
+      "dependencies": {
+        "babel-runtime": {
+          "version": "6.26.0",
+          "resolved": "https://registry.npmjs.org/babel-runtime/-/babel-runtime-6.26.0.tgz",
+          "integrity": "sha1-llxwWGaOgrVde/4E/yM3vItWR/4=",
+          "dev": true
+        },
+        "core-js": {
+          "version": "2.5.0",
+          "resolved": "https://registry.npmjs.org/core-js/-/core-js-2.5.0.tgz",
+          "integrity": "sha1-VpwFCRi+ZIazg3VSAorgRmtxcIY=",
+          "dev": true
+        },
+        "regenerator-runtime": {
+          "version": "0.11.0",
+          "resolved": "https://registry.npmjs.org/regenerator-runtime/-/regenerator-runtime-0.11.0.tgz",
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+          "dev": true
+        }
+      }
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@@ -434,9 +602,9 @@
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-          "dev": true,
-          "optional": true
-        },
-        "strip-ansi": {
-          "version": "3.0.1",
-          "bundled": true,
-          "dev": true
-        },
-        "strip-json-comments": {
-          "version": "2.0.1",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "tar": {
-          "version": "2.2.1",
-          "bundled": true,
-          "dev": true
-        },
-        "tar-pack": {
-          "version": "3.4.0",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "tough-cookie": {
-          "version": "2.3.2",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "tunnel-agent": {
-          "version": "0.6.0",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "tweetnacl": {
-          "version": "0.14.5",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "uid-number": {
-          "version": "0.0.6",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "util-deprecate": {
-          "version": "1.0.2",
-          "bundled": true,
-          "dev": true
-        },
-        "uuid": {
-          "version": "3.0.1",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "verror": {
-          "version": "1.3.6",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "wide-align": {
-          "version": "1.1.2",
-          "bundled": true,
-          "dev": true,
-          "optional": true
-        },
-        "wrappy": {
-          "version": "1.0.2",
-          "bundled": true,
-          "dev": true
-        }
-      }
-    },
     "function-bind": {
-      "version": "1.1.0",
-      "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.0.tgz",
-      "integrity": "sha1-FhdnFMgBeY5Ojyz391KUZ7tKV3E=",
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/function-bind/-/function-bind-1.1.1.tgz",
+      "integrity": "sha512-yIovAzMX49sF8Yl58fSCWJ5svSLuaibPxXQJFLmBObTuCr0Mf1KiPopGM9NiFjiYBCbfaa2Fh6breQ6ANVTI0A==",
       "dev": true
     },
     "functional-red-black-tree": {
@@ -1977,12 +1522,6 @@
       "integrity": "sha1-mGbfOVECEw449/mWvOtlRDIJwls=",
       "dev": true
     },
-    "js-yaml": {
-      "version": "3.9.0",
-      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.9.0.tgz",
-      "integrity": "sha512-0LoUNELX4S+iofCT8f4uEHIiRBR+c2AINyC8qRWfC6QNruLtxVZRJaPcu/xwMgFIgDxF25tGHaDjvxzJCNE9yw==",
-      "dev": true
-    },
     "jschardet": {
       "version": "1.5.0",
       "resolved": "https://registry.npmjs.org/jschardet/-/jschardet-1.5.0.tgz",
@@ -2099,6 +1638,20 @@
       "integrity": "sha512-q4spe4KTfsAS1SUHLO0wz8Qiyf1+vMIAgpRYioFYDMNqKfHQbg+AVDH3i4fvpl71/P1L0dBl+fQi+P37UYf0ew==",
       "dev": true
     },
+    "md5.js": {
+      "version": "1.3.4",
+      "resolved": "https://registry.npmjs.org/md5.js/-/md5.js-1.3.4.tgz",
+      "integrity": "sha1-6b296UogpawYsENA/Fdk1bCdkB0=",
+      "dev": true,
+      "dependencies": {
+        "hash-base": {
+          "version": "3.0.4",
+          "resolved": "https://registry.npmjs.org/hash-base/-/hash-base-3.0.4.tgz",
+          "integrity": "sha1-X8hoaEfs1zSZQDMZprCj8/auSRg=",
+          "dev": true
+        }
+      }
+    },
     "micromatch": {
       "version": "2.3.11",
       "resolved": "https://registry.npmjs.org/micromatch/-/micromatch-2.3.11.tgz",
@@ -2166,13 +1719,6 @@
       "integrity": "sha1-MHXOk7whuPq0PhvE2n6BFe0ee6s=",
       "dev": true
     },
-    "nan": {
-      "version": "2.6.2",
-      "resolved": "https://registry.npmjs.org/nan/-/nan-2.6.2.tgz",
-      "integrity": "sha1-5P805slf37WuzAjeZZb0NgWn20U=",
-      "dev": true,
-      "optional": true
-    },
     "natural-compare": {
       "version": "1.4.0",
       "resolved": "https://registry.npmjs.org/natural-compare/-/natural-compare-1.4.0.tgz",
@@ -2303,9 +1849,9 @@
       "dev": true
     },
     "pbkdf2": {
-      "version": "3.0.12",
-      "resolved": "https://registry.npmjs.org/pbkdf2/-/pbkdf2-3.0.12.tgz",
-      "integrity": "sha1-vjZ4XFBn6kjYBv+SMojF91C2uKI=",
+      "version": "3.0.13",
+      "resolved": "https://registry.npmjs.org/pbkdf2/-/pbkdf2-3.0.13.tgz",
+      "integrity": "sha512-+dCHxDH+djNtjgWmvVC/my3SYBAKpKNqKSjLkp+GtWWYe4XPE+e/PSD2aCanlEZZnqPk2uekTKNC/ccbwd2X2Q==",
       "dev": true
     },
     "pify": {
@@ -2502,9 +2048,9 @@
       "dev": true
     },
     "resolve": {
-      "version": "1.3.3",
-      "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.3.3.tgz",
-      "integrity": "sha1-ZVkHw0aahoDcLeOidaj91paR8OU=",
+      "version": "1.4.0",
+      "resolved": "https://registry.npmjs.org/resolve/-/resolve-1.4.0.tgz",
+      "integrity": "sha512-aW7sVKPufyHqOmyyLzg/J+8606v5nevBgaliIlV7nUpVMsDnoBGV/cbSLNjZAg9q0Cfd/+easKVKQ8vOu8fn1Q==",
       "dev": true
     },
     "resolve-from": {
diff --git a/package.json b/package.json
index 0ecb0f8..045a308 100644
--- a/package.json
+++ b/package.json
@@ -1,12 +1,12 @@
 {
   "name": "potprox",
-  "version": "0.5.0",
+  "version": "0.5.1",
   "description": "Approximation of computed data with empirical pair potentials",
   "main": "src/potprox.js",
   "scripts": {
     "lint": "eslint src/**/*.js",
     "test": "echo \"Error: no test specified\" && exit 1",
-    "build": "browserify src/potprox.js --standalone potprox -o dist/potprox.js && babel dist/potprox.js -o dist/potprox.min.js"
+    "build": "node scripts/build.js"
   },
   "repository": {
     "type": "git",
@@ -25,11 +25,13 @@
   "bugs": {
     "url": "https://github.com/Amphiluke/potprox/issues"
   },
-  "homepage": "https://github.com/Amphiluke/potprox#readme",
+  "homepage": "https://amphiluke.github.io/potprox/",
   "devDependencies": {
-    "babel-cli": "^6.24.1",
+    "babel-cli": "^6.26.0",
+    "babel-core": "^6.26.0",
     "babel-preset-babili": "0.1.4",
     "browserify": "^14.4.0",
-    "eslint": "^4.3.0"
+    "eslint": "^4.5.0",
+    "through2": "^2.0.3"
   }
 }
diff --git a/scripts/build.js b/scripts/build.js
new file mode 100644
index 0000000..a31db8b
--- /dev/null
+++ b/scripts/build.js
@@ -0,0 +1,34 @@
+let fs = require("fs");
+let through2 = require("through2");
+let browserify = require("browserify");
+let babel = require("babel-core");
+let pkg = require("../package.json");
+
+function transform(transpile = false) {
+    let contents = "";
+    let transformFn = (chunk, enc, cb) => {
+        contents += chunk;
+        cb();
+    };
+    let flushFn = (cb) => {
+        let code = `// ${pkg.name} v${pkg.version}\n// ${pkg.homepage}\n`;
+        if (transpile) {
+            // disable the minify-builtins plugin as it generates global variables
+            code += babel.transform(contents, {presets: [["babili", {builtIns: false}]]}).code;
+        } else {
+            code += contents;
+        }
+        cb(null, code);
+    };
+    return through2({objectMode: true}, transformFn, flushFn);
+}
+
+let bundleStream = browserify("./src/potprox.js", {standalone: "potprox"}).bundle();
+
+bundleStream
+    .pipe(transform())
+    .pipe(fs.createWriteStream("./dist/potprox.js"));
+
+bundleStream
+    .pipe(transform(true))
+    .pipe(fs.createWriteStream("./dist/potprox.min.js"));
\ No newline at end of file
diff --git a/src/potentials/buckingham.js b/src/potentials/buckingham.js
index d571231..df331b6 100644
--- a/src/potentials/buckingham.js
+++ b/src/potentials/buckingham.js
@@ -8,6 +8,17 @@ class Buckingham {
         this.a = a;
     }
 
+    /**
+     * The name of the potential class. To be used instead of
+     * `instance.constructor.name` (since in the minified version names are mangled)
+     * @type {String}
+     * @readonly
+     * @static
+     */
+    static get type() {
+        return "Buckingham";
+    }
+
     /**
      * Create an instance of the Buckingham potential via approximation of input data.
      * This method performs fast initial approximation and is not very accurate.
@@ -172,7 +183,7 @@ class Buckingham {
     }
 
     toJSON() {
-        return {type: "Buckingham", d0: this.d0, r0: this.r0, a: this.a};
+        return {type: Buckingham.type, d0: this.d0, r0: this.r0, a: this.a};
     }
 }
 
diff --git a/src/potentials/lennard-jones.js b/src/potentials/lennard-jones.js
index 8c673ed..1264767 100644
--- a/src/potentials/lennard-jones.js
+++ b/src/potentials/lennard-jones.js
@@ -7,6 +7,17 @@ class LennardJones {
         this.sigma = sigma;
     }
 
+    /**
+     * The name of the potential class. To be used instead of
+     * `instance.constructor.name` (since in the minified version names are mangled)
+     * @type {String}
+     * @readonly
+     * @static
+     */
+    static get type() {
+        return "LennardJones";
+    }
+
     /**
      * Create an instance of the Lennard-Jones potential via approximation of input data
      * @param {Array.<{r: Number, e: Number}>} data - Coordinates for approximation
@@ -61,6 +72,13 @@ class LennardJones {
         instanceData.get(this).sigma = value;
     }
 
+    get r0() {
+        return 1.122462048309373 * this.sigma;
+    }
+    set r0(value) {
+        this.sigma = value / 1.122462048309373;
+    }
+
     /**
      * Calculate the energy for the given interatomic distance
      * @param {Number} r
@@ -78,7 +96,7 @@ class LennardJones {
     }
 
     toJSON() {
-        return {type: "LennardJones", epsilon: this.epsilon, sigma: this.sigma};
+        return {type: LennardJones.type, epsilon: this.epsilon, sigma: this.sigma};
     }
 }
 
diff --git a/src/potentials/morse.js b/src/potentials/morse.js
index 196302d..8d9e650 100644
--- a/src/potentials/morse.js
+++ b/src/potentials/morse.js
@@ -8,6 +8,17 @@ class Morse {
         this.a = a;
     }
 
+    /**
+     * The name of the potential class. To be used instead of
+     * `instance.constructor.name` (since in the minified version names are mangled)
+     * @type {String}
+     * @readonly
+     * @static
+     */
+    static get type() {
+        return "Morse";
+    }
+
     /**
      * Create an instance of the Morse potential via approximation of input data.
      * This method performs fast initial approximation and is not very accurate.
@@ -166,7 +177,7 @@ class Morse {
     }
 
     toJSON() {
-        return {type: "Morse", d0: this.d0, r0: this.r0, a: this.a};
+        return {type: Morse.type, d0: this.d0, r0: this.r0, a: this.a};
     }
 }
 
diff --git a/src/potentials/rydberg.js b/src/potentials/rydberg.js
index 42cbdbd..239f414 100644
--- a/src/potentials/rydberg.js
+++ b/src/potentials/rydberg.js
@@ -8,6 +8,17 @@ class Rydberg {
         this.b = b;
     }
 
+    /**
+     * The name of the potential class. To be used instead of
+     * `instance.constructor.name` (since in the minified version names are mangled)
+     * @type {String}
+     * @readonly
+     * @static
+     */
+    static get type() {
+        return "Rydberg";
+    }
+
     /**
      * Create an instance of the Rydberg potential via approximation of input data.
      * This method performs fast initial approximation and is not very accurate.
@@ -167,7 +178,7 @@ class Rydberg {
     }
 
     toJSON() {
-        return {type: "Rydberg", d0: this.d0, r0: this.r0, b: this.b};
+        return {type: Rydberg.type, d0: this.d0, r0: this.r0, b: this.b};
     }
 }
 
diff --git a/src/potentials/varshni3.js b/src/potentials/varshni3.js
index ecaeee8..903d992 100644
--- a/src/potentials/varshni3.js
+++ b/src/potentials/varshni3.js
@@ -8,6 +8,17 @@ class Varshni3 {
         this.b = b;
     }
 
+    /**
+     * The name of the potential class. To be used instead of
+     * `instance.constructor.name` (since in the minified version names are mangled)
+     * @type {String}
+     * @readonly
+     * @static
+     */
+    static get type() {
+        return "Varshni3";
+    }
+
     /**
      * Create an instance of the Varshni potential (III) via approximation of input data.
      * This method performs fast initial approximation and is not very accurate.
@@ -166,7 +177,7 @@ class Varshni3 {
     }
 
     toJSON() {
-        return {type: "Varshni3", d0: this.d0, r0: this.r0, b: this.b};
+        return {type: Varshni3.type, d0: this.d0, r0: this.r0, b: this.b};
     }
 }
 
diff --git a/src/potprox.js b/src/potprox.js
index 0270a66..e7267f5 100644
--- a/src/potprox.js
+++ b/src/potprox.js
@@ -1,10 +1,14 @@
-let potprox = {
-    LennardJones: require("./potentials/lennard-jones.js"),
-    Buckingham: require("./potentials/buckingham.js"),
-    Morse: require("./potentials/morse.js"),
-    Rydberg: require("./potentials/rydberg.js"),
-    Varshni3: require("./potentials/varshni3.js")
-};
+let potentialClasses = [
+    require("./potentials/lennard-jones.js"),
+    require("./potentials/buckingham.js"),
+    require("./potentials/morse.js"),
+    require("./potentials/rydberg.js"),
+    require("./potentials/varshni3.js")
+];
+
+let potprox = Object.create(null);
+
+potentialClasses.forEach(potentialClass => potprox[potentialClass.type] = potentialClass);
 
 // Other properties of the potprox object are non-enumerable to avoid mixing them with
 // potential classes when using such methods as Object.keys, Object.values etc.