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Fig. 4

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Relative errors of the stellar parameters derived by MATISSE (left column), DEGAS (middle column), and the final adopted pipeline (right column), at 70% of the error distribution as a function of the signal-to-noise ratio. Intermediate temperature (5000 < Teff < 6000 K) thin disc (−0.25 <  [M/H]  < 0.5 dex) and thick disc (−1.5 <  [M/H]  < −0.25 dex) dwarf stars are represented as black diamonds and red triangles symbols, respectively. Halo giant stars (Teff < 6000 K, log    g < 3.5, −2.5 <  [M/H]  < −1.25 dex) are blue squares.

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