  We study the possibility that galactic rotation curves can be explained by a
gravitational potential that contains a linear term as well as a Newtonian one.
This hypothesis, suggested by conformal gravity, does allow good fits to the
galactic rotation curves of the galaxies we study, which have a wide range of
luminosities. However, the universality one might have expected of the
parameter describing the strength of the linear potential does not emerge.
Instead, a different regularity is seen.
