Effective radius (r_eff) plotted against M_⋆ on a logarithmic scale for ETGs listed by Calderón et al. (2020) in the photometric catalogue of the Antlia cluster, including candidates (open circles) and spectroscopically confirmed members (filled circles), with the cEs FS90 110 and FS90 192 represented by a diamond and a pentagon, respectively. A sample of cEs from the literature is depicted with green squares (Grèbol-Tomàs et al. 2023), orange triangles (Ferré-Mateu et al. 2018), and upside-down blue triangles (Chilingarian et al. 2009). Open (filled) stars denote massive compact galaxies (relics) from Ferré-Mateu et al. (2017) and Spiniello et al. (2024).