  We model the surface brightness profiles of a sample of 119 Abell Brightest
Cluster Galaxies (BCG), finding a generalised deVaucouleurs R^{1/n} law, where
n is a free parameter, to be appropriate. Departures from the R^{1/4} law are
shown to be a real feature of galaxy profiles, not due to observational errors
or coupling of n with the other model parameters. BCG typically have values of
n greater than 4. The shape parameter n is shown to correlate with effective
half-light radius, such that the larger BCG have larger values of n. This
continues a trend noticed amongst ordinary elliptical galaxies and dwarf
ellipticals, such that the fainter galaxies have smaller values of n.
