Left: G^rP20 vs. M20 measured in the rest-frame optical images of z2LARS (big diamonds). Open circles indicate z2LARS-LAEs. Data from the literature are presented as small symbols: LBGs detected in the Hubble Deep Field-North and measured by Lotz et al. (2004, green squares), passive and star-forming BzK (Lee et al. 2013, grey diamonds and yellow squares), and z ~ 2.5 SMGs (Aguirre et al. 2013, black circles), where the measurements are all performed on HST images. The dashed line indicates the separation between normal galaxies and merging systems by Lotz et al. (2008). Right: G^rP20 vs. M20 measured in the Lyα images of z2LARS (big diamonds). The colour coding for LARS galaxies is as used throughout this paper. The dashed red line represents the rest-frame optical (left panel) separating region, drawn to guide the eye.