Posterior distributions of the best-fitting model parameters listed in Table 1 plotted using corner (Foreman-Mackey 2016). The shaded regions in each panel bar the diagonal ones show the 16th, 50th, and 84th percentiles going from darkest to lightest in colour. We have smoothed the contours by setting the smooth parameter to 1 in the corner function to better-highlight the 16th percentile region. The diagonal panels show the flattened histogram for each parameter (unsmoothed).