Mass–h_R, morph diagram. Disk galaxies from TNG50 are represented by the blue-shaded area, while observed disk galaxies from SDSS DR7 are shown in the gray-shaded region. The solid profiles are the median. The shaded areas denote the 1σ envelope, representing the 16th and 84th percentiles. For the SDSS data, we used scale-length values from Simard et al. (2011) and stellar-mass data from Mendel et al. (2014). It is apparent that SDSS galaxies are consistent with TNG50 disk galaxies, and the difference between halo-subdominated galaxies and tiny-halo galaxies is minimal. The green triangles and the histograms on the right illustrate that the data utilized in Mancera Piña et al. (2021, green) are biased towards smaller-sized galaxies.