The zero point offsets, ΔM = M − Mcomb, for each band with respect to the reference PL relations from Paper I as a function of sample metallicity. The full lines show the weighted linear regression fit to the data. It can be seen that especially in the limited but for extragalactic distance determination most important metallicity range from LMC to solar abundance, the zero point offsets are in general indistinguishable from zero.
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