Comparison of effective radii as measured with this work procedures vs. van der Wel et al. (2014) estimates adopted for the field reference sample. Measurements are compared for a random portion of the control field galaxy sample (see text), split by Sersic index as indicated. The solid lines show the bisector (middle), and the expected average uncertainty (1σ) on effective radii from this work, as estimated with simulations (see Sect. 2.4) for sources at the faint end of the probed magnitude range.