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Fig. C.1

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Decomposition of the metallicity distribution of the LAMOST sample, subdivided into 0 < LZ < 600 kpc km s−1 (top) and −600 < LZ < 0 kpc km s−1 (bottom), respectively. The left panels show the case of high-α stars, and the right panels for low-α stars. The solid lines represent the best-fitting results from the same decomposition procedure as in the main samples (see Figs. 8 and 9).

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