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How were interstellar reddening values for cepheid first calculated?

I mean, other than using the derived equation to get extinction-corrected magnitude of Cepheids, I want to know how to drive them independently from measured raw data (maybe V, B-band colors, etc).

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  • $\begingroup$ Can you clarify - are you looking for redshift values as seen from Earth? $\endgroup$ – Carl Witthoft Oct 31 '16 at 14:26

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