  Hadronic Z0 decays with identified electrons or muons have been used to
measure the forward-backward asymmetries of e^+e^- --> Z0 --> bbbar and e^+e^-
--> Z0 --> ccbar events. The asymmetries at three centre-of-mass energies, and
the average B mixing parameter, chi, are determined in a simultaneous fit to
events with one or two lepton candidates.
