RSR linecheck MWC349a failing

[teuben]

All ~20 datasets that use MWC349a seem to exhibit extraneous badcb flagging , resulting in essentially no spectrum. For a few of the historic data that was checked , band 5 chassis 2 survived this onslaught and gave a partial spectrum.

Clearly something odd is going on here.

[teuben]

quoting Min:

On MWC349a linecheck, the RSR data suffers from the limited dynamic range resulting from the strong continuum present. In all cases with a strong continuum (>1 Jy), the RSR will show strong continuum baseline. The line is visible and can be analyzed, but it may not work like the ULIRG CO lines.

[teuben]

The keyword shortlags=32,10.0 can help in dealing with a strong continuum source.

[dsancheza]

Looking into another I05189 linecheck I noticed observations: 104911 and 104912. Online reduction yields ~35 mK for the CO line. However running with SLpipeline.sh flags too many chassis and flux from the line disminishes down to 0.8 mK. Looking to the bad lags I believe the badcb is biasing the statistic in the ACF spike detection.

In the previous image the priori badcb are 0/0,1/1,2/1,3/5. But the badlags marks as badcb all the boards in chassis 1 but 1/1. This is also the caso with chassis 3. Probably we should send the priori badcb as an input and the ignore those chassis from the sigma calculation in badlags.py