Stellar kinematics and stellar populations for UDGs from the literature compared with UDG11. Histograms (in grey) represent the stellar mass (top-left), velocity dispersion (top-right), age (bottom-left), and metallicity (bottom-right) for UDGs from previous works (Ruiz-Lara et al. 2018; Ferré-Mateu et al. 2018; Chilingarian et al. 2019; van Dokkum et al. 2019; Emsellem et al. 2019; Fensch et al. 2019; Gannon et al. 2021, 2023; Toloba et al. 2018; Martín-Navarro et al. 2019). In all panels, the average value derived for UDG11 and error estimates are marked with the vertical red dashed and dotted lines, respectively. Values are obtained from the fit of the stacked spectrum inside 1R_e, and are listed in the first column of Table 2.