For each sample galaxy, 100 realisations of the light profile were generated and then decomposed in the same way as the modelling of the actual galaxy light profile (see Fig. D.1). This exercise has a twofold merit: to estimates of the uncertainties on the best-fitting structural parameters and to perform an MC-based estimates of the structural parameters for the galaxy components. Panels show the histograms of the best-fitting parameters for the bulge, disc, and second Sérsic component from fits to the realisations for 50 LeMMINGs galaxies (see the text for details). Gaussian model fits to the best-fitting parameter distributions (red curves) together with the associated mean and standard deviation values are shown. These mean values are MC-based measurements of the best-fitting structural parameters for the galaxy components, which overall are in good agreement with those adopted in this work indicated by dashed vertical line (see Tables B.2 and B.3).