  We have investigated a system with two sets of staggered fermions with
charges 1 and -1/2 coupling to a non-compact U(1) gauge field in 4 dimensions.
The model exhibits breaking of chiral symmetries of both fermions at different
values of beta. Chiral condensates, renormalized fermion masses and
renormalized charges have been measured. The renormalized charges show
agreement with one-loop perturbation theory. We examine surfaces of constant
renormalized charges in the space of bare parameters.
