Left panel: histogram with the 2D stellar mass density within one effective radius () of our MUG sample, split between disk- (blue) and spheroid-like (red) morphology (n < 2.5 and n > 2.5, respectively). The solid histogram denotes the objects with M_⋆ > 8 × 10¹⁰ M_⊙ and the dashed one those with 6 × 10¹⁰ < M_⋆/M_⊙ < 8 × 10¹⁰. Overplotted, as vertical dotted lines, are the values for the confirmed relic galaxies in Ferré-Mateu et al. (2017). The MUGs in our study span the range of values expected of relic galaxies. Right panel: histogram showing the 3D stellar mass density within one effective radius of our MUG sample, again dividing it between M_⋆ > 8 × 10¹⁰ M_⊙ (solid histogram) and 6 × 10¹⁰ < M_⋆/M_⊙ < 8 × 10¹⁰ (dashed histogram). We split the galaxies into disk- (blue) and spheroid-like (red) morphology (n < 2.5 and n > 2.5, respectively). We also compute their densities differently: h for disks (with h = 1 kpc), and for spheroids. Overplotted are the values of the confirmed local relic galaxies from Ferré-Mateu et al. (2017) – using our formula for disks. On average, disks appear slightly denser than spheroids.