This plot monitors the rms of the product generated by the zimpol polarimetry mode flat recipe. 
Only the polarimetric direction = zero and cycle  = odd signal is monitored. 
The following setups are covered:

<ul>
<li> V filter,   DIT, NDIT = 4.0, 10
<li> N_R filter, DIT, NDIT = 2.0, 20
<li> N_I filter, DIT, NDIT = 2.0, 40
</ul>
The plot contains four boxes, which shows the counts 
for both read modes (SlowPolarimetry and Fastpolarimetry) and for both
detectors.