One‐dimensional cuts through the likelihood functions for a double–Gaussian velocity PDF where the torque decay time τ_K is allowed to vary for different values of braking index. The heavy solid line for n = 2.5 yields the maximum likelihood solution at τ_K ~ 3 Myr. The two heavy dashed lines, for n = 4 and 4.5, yield the maximum likelihood if there is no decay, τ_K → ∞.