Corner plot of the results of the MCMC search of the viable parameter space. The contour plots show the correlations between parameters, and the histograms show the one-parameter distribution within the model evaluation. The best-fit values of the model parameters are , , , and , where q_s can probably be increased to arbitrarily high values and remain a good fit. q_m is strongly constrained, while the other parameters have significant areas in which the fit quality is lower that are not strongly excluded.