Estimation of the aperture loss as a function of the disk R50 in arcseconds. The line and error bars are obtained calculated the median aperture loss obtained on disk R50 bins including a fixed number of 50 sources. The method to estimated the loss due to the aperture is described in the text. The results are presented for a sub-sample of 1248 sources with all morphological parameters set at their default value (see Sect. 2.3.2) except the disk R50, which varies from 0.″l up to 2″. We indicated with black thick lines the range of sizes corresponding to the different apertures in pixels, recalling that the spatial resolution of the NISP instrument is 0.″3.