Comparison of AMBRE results of parameters determination for RED580 PASTEL, benchmark and atlas samples with accepted values. a)T_eff; b) log g; c) [Fe/H] vs. [M/H]; d) [α/Fe] vs. α-relation; e) HR diagram – calibration; f) [M/H] vs. [α/Fe] – calibration; g) RED580 HR diagram; h) RED580 [M/H] vs. [α/Fe]. Raw results are in cyan, bias-corrected results are in black. The black dashed line shows the log g limit used to separate giants and dwarfs. The grey dot-dashed lines indicate the crossover region.