Plotting Sequential Spectral Profiles

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Affiliation
American Association of Variable Star Observers (AAVSO)
Mon, 12/07/2020 - 19:45

I've begun doing my data reduction with Demetra  for spectra obtained with an Alpy 600. How could I get sequential profiles of the same star taken on different days, on one page, so that I could compare changes is the spectra?

Thanks

Dick