Left: sAM sequence normalization as a function of (V/σ_t)_toz1 for the UDF mosaic sample of SFGs where the color representes the SFR-weighted log R_1/2,[O II]. The left y-axis is found from the fiducial fits shown in Figs. 11–12 (see Table 1). The right y-axis shows the corresponding effective spin λ × f_j according to Eq. (8) using the zero-poing of Eq. (8). The solid histograms show the distributions from the data. The solid line shows the log-normal distribution P(λ) expected for halos (Bett et al. 2007). Right: same for the matched TNG50 sample of SFGs.