This plot shows the median counts collected with the IFU halogen lamp within DIT=1.6507260 sec 
with IFS unit and no neutral density filter in the optical path. 
This plot monitors the lamp power. 
(The pipeline does not provide the counts or the S/N ratio of individual slices of the master flat).
The raw frames are generated by the TPL NAME = 'Short calibration procedure for IFS' template.
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For setup YJ values of about 2500 ADU are generated by the template 
with TPL NAME = 'Static Weekly Flats for IFS', using DIT=2sec.
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The counts in the indiviual slices is ~4 (3)  times larger than the frame plane average counts for the YH (YJ) prism.
Using NDIT=10 the total counts in the slice in the raw frame cube is a factor 30 (40) larger. 
Therefore 1000 (1300) ADU must be achieved  as average counts number in one plane of a raw frame cube to
gain sqrt ( 1000 * 10 * 4 (3) ) =  200 S/N for the YJH (YJ) prism.