Comparison of selection techniques. Left: size-mass relation for the SFGs in the UDF mosaic sample (blue circles). The sizes are adjusted to z = 1 according to the (1 + z)^−0.5 evolution found by van der Wel et al. (2014). The solid line (gray band) represent the size-mass relation of Mowla et al. (2019) (van der Wel et al. 2014). Right: main-sequence relation for the SFGs in the UDF mosaic sample. The SFRs are adjusted to z = 1 according to the (1 + z)^1.74 evolution of Boogaard et al. (2018) whose z = 1 main sequence is represented by the gray band. In both panels, the points are color-coded according to effective S/N. For comparison we show the properties of the mock 158 galaxies (Sect. 3.2) as red circles.