The exposure meter DRP has been applying incorrect wavelength solutions to the exposure meter files. This was fixed on or about 2023 June 5 and may have been in place as far back as 2023 Feb 14.
The raw 2D files are not saved after the proceeded 1D files are ingested in to KOA, so we are unable to correct old data directly.
An example exposure meter spectrum (pulled from Jump) is show below. This spectrum has the bad wavelength solution and the offsets are substantial in the red. The annotations show the degree os offset for H-beta and H-alpha lines.
