Posterior probability distributions for the free parameters of the PO model of the HR 8799 system (gray curves). The shades of gray are for 1σ, 2σ, and 3σ confidence intervals. Red curves mark the Gaussian priors set for five out of 11 model parameters. The red areas under the curves indicate 1σ ranges of each parameter. The remaining six parameters of the model have the uniform (noninformative) priors, not shown in the plot. See Table 1 and the text in Appendix A.