  A combined expansion in the number of QCD colors 1/N_c and SU(3) flavor
breaking parameter epsilon has long been known to provide an excellent
accounting for the mass spectrum of the lightest spin-1/2, 3/2 baryons when the
quarks are taken to transform under the fundamental SU(N_c) representation, and
in the final step N_c \to 3 and epsilon is set to its physical value ~0.3.
Subsequent work shows that placing quarks in the two-index antisymmetric
SU(N_c) representation leads to quantitatively equally successful mass
relations. Recent lattice simulations allow for varying the value of epsilon
and confirm the robustness of the original 1/N_c relations. In this paper we
show that the same conclusion holds for the antisymmetric quarks, and
demonstrate that the mass relations also hold under alternate prescriptions for
identifying physical baryons with particular members of the large N_c
multiplets.
