Comparison of the original distribution of parameters (upper row) vs. the one recovered after the fitting process (lower row). We show the two parameter spaces that are of most interest in the remainder of the paper, namely [Fe/H]_i vs. [Fe/H]_o and [α/Fe]_i vs. [α/Fe]_o. Left panel: the case in which the total library of mock galaxies is analyzed. Right panel: the case in which only mock galaxies with −0.2 ⟨ [Fe/H]_i, [Fe/H]_o⟨ 0.0 are analyzed.