Comparison of results for adev, χ², log(LWA), light-weighted [Fe/H], and A_v obtained from multipopulation fits. Left column: difference in derived values between MILES and SynCoMiL SPS models. Right column: difference in derived values between Coelho14ext and SynCoMiL SPS models. Dots are color-coded according to the goodness of fit: blue and green dots represent fits with χ² ≤ 3 and χ² > 3 for both SPS models, respectively. The black dots correspond to fits with χ² ≤ 3 for one SPS model and >3 for the other.