Figure 9: The dynamical acceleration in units of plotted against the
characteristic baryonic surface density [275]. Points as per Figure 5. The dotted line shows the
relation that would be obtained if the visible baryons sufficed to explain the observed
velocities in Newtonian dynamics. Though the data do not follow this line, they do show a correlation
( ). This clearly indicates a dynamical role for the baryons, in contradiction to the simplest
interpretation [109] of Figure 5 that dark matter completely dominates the dynamics.
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