Kinematic modeling of the rotation curve of HZ4. Left: intrinsic rotation curve (corrected by inclination) of HZ4 for baryons (red), dark matter (black), and total (blue) from the best-fit model. The green vertical line shows the R_e, and the red colored box represents the spatial scales of baryon dominance in HZ4. Right: dark-matter fraction within R_e of HZ4 (orange diamond), main-sequence, star-forming galaxies at z ≈ 1 − 2 (gray box; Genzel et al. 2020), and the best linear fit to z ∼ 0 late-type galaxies (blue line), and z ∼ 0 ATLAS-3D early-type galaxies (red curve; Cappellari 2016).