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Fig. 3

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Flux ratios of raw (left panel) and dereddened (right panel) fluxes from Gaia BP/RP spectra. The color-coding reflects the metal-licity of the stars of the dataset we used. Below the dashed-dotted and dotted lines are the flux-ratio areas where stars with [Fe/H] ≤ −1 and [Fe/H] ≤ −2, respectively, are primarily found.
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