Changes

The spectrograph camera does not have a shutter, so even though bias frames are zero second exposures, you still need to take them when no light can reach the detector. Ideally while the mirror cover is still closed, or at least not while pointing to an object, or while an arc lamp or the slit illumination etc is on. The bias level on SpUpNIC is stable, but these frames take next-to-no time, so just snap a bunch of them (say 25?) every day.