On GMOS-S data affected by the CCD1 CTE problem.
It was recently reported that the observed counts in spectra seemed to be lower than expected on CCD1 for some programs - also, odd emission-like features (‘spikes’) were noticed in the CCD1 portion on stellar spectra that are known to be featureless. All this applies only to data acquired during the ‘bad-CTE’ periods of CCD1, i.e. between: