Fig. 1.
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Chemical inhomogeneities in the Galactic disc for three different samples. Left panel: selection of Samples A, B, and C in the Kiel diagram. Right panels: mean metallicity in heliocentric coordinates for Samples A, B, and C (from left to right, respectively) in the Galactic plane. The position of the Sun is shown by the white cross in (X, Y) = (0 kpc, 0 kpc); the Galactic centre is to the right; and Galactic rotation is going clockwise.
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