Spectra of two stars in Cassiopeia with CCDSPEC

Not sure which two stars these are – I was grabbing two stars as the clouds came in……..

Although many of the lines are the same in both stars, there is are some significant differences – in particular the dip at 487.9nm on the spectrum for star I stands out.

Star I:

Star II:

Dip on star I’s spectrum not present in star II’s spectrum:

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