Fig. 7
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Comparison of true photometric metallicity values from Muraveva et al. (2025) with the metallicity predicted by the GRU model for 108 766 RRab (left panel) and 13 388 RRc stars (right panel) in the test set. The dashed black lines indicate the identity function (y=x). Each point is colour-coded according to the number of G-band epochs (Nepochs) available in the Gaia DR3 catalogue for each star.
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