Figure 6: The fractional contribution to the total velocity at the radius where the
contribution of the baryons peaks for both baryons ( , top) and dark matter ( ,
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 and depends on choice of stellar mass estimator,
but the fine-tuning between them must persist for any choice of .
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