Here we show various parameters for NIR dark frames: median level and
rms of the master dark, the cosmic ray hit rate (per second and unit
area), and the amplitude of the fixed pattern divided by the dark_med value.
For DIT=1.0, darks are acquired with NDIT=3, for all other DIT, darks are acquired with NDIT=1.
For DIT=5sec: from 2018-11 on darks are taken with NDIT=1, before with NDIT=5.