Angular momentum (u_φ) in a Schwarzschild slim disk for two accretion rates. For very low accretion rates the angular momentum follows the Keplerian profile (dotted line) down to the ISCO. For high accretion rates the flow is super-Keplerian between the “center” of the disk at r_cen and the “potential spout” at r_pot. The vertical dot-dashed line on this and subsequent figures denotes the location of the ISCO.