Mode of the metallicity distribution of dSphs within 3 kpc of their centre as a function of luminosity within the same radius. Models that retain less than 80% of their stellar mass are shown as open circles. For clarity, all dSphs are shown as circles, regardless of the number of perigalacticons. dSphs that suffer substantial mass loss show a higher mean metallicity than smaller undisturbed systems. In undisturbed cases, the model dSphs have a lower ⟨[Fe/H]⟩ (by up to 0.5 dex) than the observed dSphs at the same luminosity. From left to right the groups of simulation points correspond to Carina-type dSphs (orange), Sextans (green), Sculptor (blue), and Fornax (red). Observational values are shown in magenta.