Same as Figure  1, but with q-dependent thresholds for our ellipsoidal gap-opening criterion. The dashed curves are the threshold between the opened simulations and the closed simulations predicted by our flat spiral gap-opening criterion (see Section 5). For all panels, the flat spiral gap-opening criterion successfully separates the closed simulations from the opened simulations. In (a), for the equal-mass binaries ( q = 1) both the flat spiral gap-opening criterion and the ellipsoidal gap-opening criterion successfully separate the closed from the opened simulations.