Update README.md

README.md

@@ -12,4 +12,4 @@ tuned, acheiving 70% improvement in RMS error between sensors.
 
 ![Model assessment](https://github.com/DeanHenze/WISPER_crosscal_models/blob/main/figure_model_assessment.png)
 
-$y = \Sigma_{i}^{n1}[c_{1i}x_{1}^{i}] + \Sigma_{i}^{n2}[c_{2i}x_{2}^{i}] + \Sigma_{i}^{n12}[c_{12i}x_{12}^{i}] + error$
+$so_{cal} = \Sigma_{i}^{n1}[c_{1i}x_{1}^{i}] + \Sigma_{i}^{n2}[c_{2i}x_{2}^{i}] + \Sigma_{i}^{n12}[c_{12i}x_{12}^{i}] + error$