The white histograms show the MRS MDFs for the full available MRS sample for Sculptor, Sextans, Fornax, and Carina. The shaded histograms show the MRS MDFs for the stars in common to both the MRS and photometric samples. In all panels, the vertical black dashed line corresponds to the median metallicity value of the full sample, while the grey dashed line corresponds to the median metallicity value of the common stars. The vertical dotted-dashed line corresponds to the lower limit of the most metal-poor isochrone used of roughly  −2.5 dex.