Posterior distributions for the MCMC fit to the phase-averaged H_α emission profile. The fitting procedure includes five free parameters; 1) inner ring radius, 2) outer ring radius, 3) fractional contribution from optically thin emission, 4) absolute normalization, and 5) system velocity. The posteriors on the inner and outer ring radii yield a constraint on the radial extent of the (partially emitting) ring of δr = 14.8 ± 0.4 R_WD. The fitting procedure favored a contribution dominated by optically thin emission. The system velocity was found to be consistent with zero.