This plot shows QC parameters derived from the ZIMPOL bias recipe for read modes SlowPolarimetry and FastPolarimetry.
<br>
odd/even means the cycle<br>
zero/pi means the polarimetric phase<br>
The recipe resorts the phase=pi rows and the phase=zero rows  
and writes them in different extensions of the pipeline product.
The QC parameters describe the median and the rms of these products.