FLAMES GIRAFFE bias calibrations
(examples of bad cases)

Find here a (non-exhaustive) collection of screenshots with bias files indicating problems.

Pick noise
This screen shot displays a raw bias with read noise only. This raw bias frame (same scale, same cuts) shows in addition a pattern contributed by pick noise.
Important: this particular pattern becomes visible only at a zoom stage when single pixels are resolved (1x), and when the cuts are set to show the pattern properly (+/- 3 ADU around mean BIAS level)