Mg I EW and CaT ΣW for the foreground stars drawn from the Besançon model towards the direction of the dwarf spheroidal galaxies Sextans (top row), Sculptor (middle row) and Fornax (bottom row). The left panels show all the foreground stars, and the right panels the distribution of foreground stars left after applying a velocity criterion of 3σ around the systemic velocity of the galaxy. The dashed line indicates Eq. (1).
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