Fig. 3.
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Comparison of the theoretical PL and PW slopes of the BL Her models computed using the complete range of metallicities (−2.0 dex ≤ [Fe/H] ≤ 0.0 dex), with the empirical slopes spread across the different Gaia wavelengths. The y-scale is same (5 units) in each panel for a relative comparison. Note: the empirical PL slopes in the Gaia passbands are obtained using apparent magnitudes not corrected for extinction.
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