  The process e+e- --> p anti-p gamma is studied using 469 fb-1 of integrated
luminosity collected with the BABAR detector at the PEP-II collider, at an e+e-
center-of-mass energy of 10.6 GeV. From the analysis of the p anti-p invariant
mass spectrum, the energy dependence of the cross section for e+e- --> p anti-p
is measured from threshold to 4.5 GeV. The energy dependence of the ratio of
electric and magnetic form factors, |G_E/G_M|, and the asymmetry in the proton
angular distribution are measured for p anti-p masses below 3 GeV. We also
measure the branching fractions for the decays J/psi --> p anti-p and psi(2S)
--> p anti p.
