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Fig. 1.

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Main steps of the star-by-star procedure to obtain estimates of the RR Lyrae luminosities. Boxes on the left exhibit the steps for computing the theoretical luminosity, LHB/LNA, whereas those on the right show the steps leading to the empirical luminosity, LGaia. We follow standard notation (i.e., RP for the Gaia red and W2 for the WISE W2 magnitudes).

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