Retrieved parameter values for mean excess colour (top), its standard deviation (middle), and amplitude (bottom), as defined in Sect.3.1 over 100 mock realizations. The blue dashed line shows the respective input mock parameter values. The black dots show the individual retrieved parameter values and their uncertainty (68% interval around the maximum likelihood value). The orange dashed line shows the mean parameter values of all 100 mock realizations, weighted by their respective uncertainty. The orange shaded region shows the 1σ error on the weighted mean parameter values as computed in Eq. (B.2)