This plot shows for the given setup:
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<ul>
<li> filter = V or N_R or N_I
<li> channel = CAM1 or CAM2 
<li> readmode = SlowPolarimetry or FastPolarimetry 
</ul>

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<ul>
<li>in Box1: The counts in the raw flatfield frame. If NDIT>1, the raw frame becomes a datacube with NAXIS3 = NDIT. 
In this case the plot value correspond to the median counts in a layer of the cube. 
Values are given for polarimetric phase zero and for odd sequence number. 
<li>in Box2: signal-to-noise ratio S/N = sqrt ( NDIT * (flatcounts - biascounts)), <br>
where flatcounts are the values from Box 1 and a fixed biascounts value of 990 is used.
<li>in Box3: The same values as in Box 1 but for
polarimetric phase pi and odd sequence number. 
<li>in Box4 the same values as in Box2 but for polarimetric phase pi and odd sequence number.
<li>in Box5: The rms of the raw flatfield frame, corresponding to the same
data source as Box1.
<li>in Box6: The median of the raw frame cube plane medians. 
<li>in Box7: The rms of the raw flatfield frame, corresponding to the same 
data source as Box3.
<li> in Box8: The rms of the raw frame cube plane medians.
</ul>