Solutions for and ε_* for various boundary conditions, ε, for the galaxy NGC 2403 assuming the best-fit Q_* for SFDM. Top: Quantity at z = 0. The solid black line shows the minimum possible value of allowed by the condition ρ_SF > 0 at each radius. The smallest boundary condition, ε = 0.08, corresponds to the minimum possible dark matter mass for the given baryonic mass distribution. Smaller masses would require that the condition ρ_SF > 0 is violated before R = R_max. Bottom: Same as the top panel but showing ε_* instead of . The minimum possible ε_* allowed by ρ_SF > 0 is a constant.