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I tried to recalibrate the spectra (starting with Sirius, using Balmer series as reference).
Came up with 0.432nm/pxl, almost the same as your 2nd result.
Applied the same dispersion to Betelgeuse (corrected for hor shift), both spectra now look consistent (green dip and some other less prominent features).
Last edited by bojan; 10-01-2020 at 06:54 PM.
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