Posteriors of the analyses of the TTVs alone. Blue: from the TTVFast N-body integrator MCMC; red: from the analytic TTV modeler TTVFaster MCMC. In both analyses, we limited ﹩e\lt 0.06﹩ for the three inner planets, in accordance with the stability analysis from B15. We also required Hill stability. We used jump parameters of the form ﹩\sqrt{e}﹩ cosω to avoid high eccentricity biases. The mass and eccentricity posteriors obtained from the analytic TTV analysis are in good agreement with those obtained with N-body modeling. The values above the histograms correspond to the N-body posterior median and ﹩1\sigma ﹩ bounds. The MCMC chains shown are available as  data behind the figure. The data used to create this figure are available.