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My suggestion with the alp Gru image is to perform a 2 line calibration making the first line the star image at 0. Then pick that deep line and call it Ha, Hb or Hg at 6563,4861, 4340.
Then overlay a b5 spectra and see which one lines up with the iter lines the best. You should have absorptions at 6869 for O2 and 7605 for H2O as well.
If the first one doesn't work then call it Hb etc until it seems right. I think it is likely to be Hg at 4340.
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