Posterior of the Bayesian ensemble EPM fit (marginalised over the times of explosion and peculiar velocities of the SNe). The plot shows the 68% confidence intervals for the one-dimensional distributions. The two dimensional projection displays the 39.3%,67.5%,86.5%,95.6% confidence regions (corresponding to the 1σ, 1.5σ, 2σ, 2.5σ levels of a two-dimensional Gaussian distribution, as described in the corner Python package documentation) (https://corner.readthedocs.io/en/latest/pages/sigmas/). The prior distributions for the one-dimensional marginalised distributions are shown as grey dashed lines.