Fig. 3
Top panel: de-reddened J magnitudes versus period with metallicities from Sollima et al. (2006a) in the color-bar. Bottom panel: the same as in the top panel, but for the KS magnitude. Dashed lines are the empirical PL−Z relations derived from our data set, evaluated at the mean RR Lyrae [ Fe / H ] = − 1.67 dex.
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