Scaling relations for the six H I disks presented in this study. The points correspond to the mean values for a given system between z = 0 and z = 0.5, with bars showing the standard deviation. Top: the H I size–mass relation (A. H. Broeils & M. H. Rhee 1997a) for these systems. M_HI is calculated as the total disk H I mass. D_HI is twice the radius at which the mean column density drops below 1.25 × 10²⁰ cm⁻². The solid (dashed) line corresponds to the observational correlation (and 3σ scatter) found in J. Wang et al. (2016).