Parameters derived from mock images vs. f_exsitu for galaxies placed at different distances and with SDSS-like observations. In each panel the black curve represents galaxies at 40 Mpc and without observational noise; the blue, green, yellow, and red curves represent galaxies with observational noise and placed at 40, 200, 400, and 600, respectively. The solid curves are running median and the dashed curves are ±1σ scatter.