Estimate of the total H-band magnitude for UDG 11. Left panel: Darker pixels indicate masked regions. All remaining pixels were used to determine the background level. Central panel: Distribution of the pixels used to estimate the background level. The blue solid line indicates the mode of the distribution, while the red dashed lines show the ±1σ range around the mode. Right panel: Curve of growth obtained from the azimuthally averaged surface brightness profile. The horizontal red dotted line marks the asymptotic value.