Light distribution of the UDG candidates in the g band. Left panel: Image thumbnail centered on the UDG of 1 × 1 arcmin (∼14.9 kpc). The black dashed circle corresponds to 1R_e, listed in Tab. 1. The black solid circle marks the outermost radius where flux blends into the sky level. This corresponds to the outermost data point shown in the plot in the right panel. The black solid contours correspond to μ_g = 29 mag/arcsec². Right panel: Azimuthally averaged surface brightness profile (black points) of the UDG shown in the left panel as a function of the semi-major axis radius, and the best-fit model (green solid line). The vertical dashed line indicates the effective radius derived from the best-fit model. The local sky level (in counts) is reported in the lower-left corner of the plot.