Rotation curves for two disk galaxies with a stellar mass of 10¹¹ M_⊙ but with a halo mass of 10¹² M_⊙ (star-forming, blue) and 10^12.6 M_⊙ (total, green). The two disk galaxies have the same stellar mass exponential profiles, with a disk scale length of 4.4 kpc and a Sèrsic index of n = 1. Dark matter halos are assumed to have an NFW profile with the concentration-mass relation from Zhao et al. (2009); c = 13 for the blue line, and c = 11 for the green line.