Figure 6

Figure 6: The fractional contribution to the total velocity Vp at the radius RP where the contribution of the baryons peaks for both baryons (Vb∕Vp, top) and dark matter (VDM ∕Vp, bottom). Points as per Figure 5. As the baryonic surface density increases, the contribution of the baryons to the total gravitating mass increases. The dark matter contribution declines in compensation, maintaining a see-saw balance that manages to leave no residual in the BTFR (Figure 5). The absolute amplitude of Vb and VDM depends on choice of stellar mass estimator, but the fine-tuning between them must persist for any choice of M ∗∕L.