Total IR luminosities and (left) effective radii and (right) surface IR luminosities for CRISTAL galaxies, SMGs at z ∼ 2.5 (Gullberg et al. 2019), lensed SMGs at z ∼ 3–6 (Spilker et al. 2016), SMGs at z = 4–6 (Riechers et al. 2014; De Breuck et al. 2014; Hodge et al. 2015; Gómez-Guijarro et al. 2018; Casey et al. 2019; Tadaki et al. 2020b), and DSFGs at z ∼ 2 (Tadaki et al. 2020a). Solid and dashed lines corresponding to each color show the median Σ_IR for each sample. Gray solid lines show the effective radii and surface IR luminosities at intervals of 0.5 dex from 0.1 kpc to 10 kpc. The black dashed line shows the representative beam size (${\sigma }_{\mathrm{beam}}={\text{FWHM}}_{\mathrm{beam}}/2\sqrt{2ln2}$). CRISTAL galaxies show approximately ten times smaller Σ_I than DSFGs or SMGs, and are less extreme galaxies than DSFGs.