Illustrating the recovery of [Fe/H](R_birth = 0 kpc) for subhalo 553837 for stellar particles 7−8 Gyr ago. The projected central metallicity ($\widehat{[\mathrm{Fe}/\mathrm{H}]}(R_{\mathrm{birth}}$ = 0 kpc); black star) was estimated from the metallicity at a given radius (8.5 kpc; black square) and the metallicity gradient at the current time. The red circle represents the true central metallicity [Fe/H](R_birth = 0 kpc), taken as the median [Fe/H](R_birth < 1 kpc). For this scenario, the central metallicity cannot be estimated accurately assuming a linear gradient due to the spike in [Fe/H] in the inner kpc. This galaxy has a weak bar (bar strength of 0.15) and a mass of 3.5 × 10¹⁰ M_⊙.