The following images are each the result of stacking five 900s dark frames using an algorithm to reject cosmic rays. They show hot spots and defective columns.
Chip 2 (7461-11-6 ) and Chip 1 (7461-14-6)
Both Images taken with left hand amplifier
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CCD1 |
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Hot Pixel Maps :-
Chip 2 and Chip 1
Both images taken through left-hand amplifiers.
The cosmic ray count was surprisingly different for the two chips; chip 1 gave 4300 events per hour, chip 2 gave 2500 events per hour.