Posterior probability distributions for cluster mass (left) and age (right) for four sample clusters taken from the catalogue of Chandar et al. (2010), as computed by cluster_slug. In each panel, the heavy blue line is the cluster_slug result, and the thin vertical dashed line is the best fit obtained by Chandar et al. (2010). The ID number printed in each pair of panels is the ID number assigned in the Chandar et al. (2010) catalogue.