Isophotal analysis of the R-band images of 13 extended UCDs. For each UCD, the top panel in each plot shows the output of the GALFIT Sérsic model (green) compared to the observed background subtracted surface brightness profile (blue line, orange points). The shape of the PSF is also plotted as dashed black line. The Sérsic index n and the identification number of the UCD is indicated within each plot. The lower panel of each plot shows the residuals between the model profile after convolution with the PSF and the observed profile. The vertical green line is the effective radius of the best-fit Sérsic profile. The last three panels in the fourth column show the model results for the King+Sérsic fits for UCD FORS 45 and 81, respectively. For UCD-FORS 32, the Sérsic+Sérsic result is shown. The two-component models of these three UCDs show improved residuals compared with their single profile fits.
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