Comparison of the individual [Fe/H] measurements as a function of SMA radius for Carina (left) and the SMC (right) between the original values (from Koch et al. 2006 and Dobbie et al. 2014, respectively, in black) calculated using the Carretta & Gratton (1997, CG97) scale, and those applying the Starkenburg et al. (2010, S10) and Carrera et al. (2013, C13) calibrations, respectively (in gray). The blue (orange) solid line and shaded area represent the result of the GPR analysis and the associated 1-σ confidence interval to the original (recalibrated) samples.