New Spredsheet version with optional extinction correction
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Since the old thread was somewhat framgemented I thought I'd start a new one. For most observers eps aur will now be observable at relatively low air mass, so I thought it might be a good idea to extend the Excel sheet with a simple "toggle switch" that will switch on/off air mass correction. In the attached file, you can do just that in cell F51
1 ==> air mass correction is performed 0 ==> air mass correction is not performed (= extinction coefficient is set to 0. No need to input observation location coordinates and observation time in this case)
Note that for both cases, the error in the comparison star mag fit is shown, so that you can actually see by trying both settings which method gives the better fit.
I'm still working on my backlog of data starting in August (!) when airmass was still ~2 for me, but in theory, with eps aur rising higher, the linear regression with air mass correction should become more and more unstable so that eventually the analysis w/o airmass should give a better fit.