This plot shows the median counts in the brightest of a set of five
raw input flats with increasing flux. Here in dual beam imaging mode the QC
parameter is monitored for the left and the right channel and for two dual
beam filters D_H23 and D_K12.
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The bi-model distribution in the right channel of the B_H setup origins from
data based on different templates: 
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In the left channel both setups (coming from two different templates) generate the same number of counts. 
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<bf>New 2018-10-16:</bf> The plot shows the counts in one plane of the raw frame cube corresponding to NDIT=1. 
For NDIT=40, the total counts in the brightest raw flat is 40 times the counts of one plane of the raw frame cube. 
To achieve a S/N-ratio = 200 in the brightest raw flat, about 1000 ADU (new threshold) must be achieved in a single plane.
The S/N ratio in the final master flat is not checked for.