Fig. 9.

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Estimate of the γ parameter for the WcHVI Wesenheit magnitude obtained by binning our data in three [Fe/H] intervals (filled blue circles). The top and middle panels show the results for two different choices of the β parameter (see labels). The bottom panel shows the results for the same slope as in the middle panel but for a different value of ϵ. For comparison, filled magenta circles show the results from Breuval et al. (2024).
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