Corner plot of the free retrieval of HR 8799e with petitRADTRANS. This plot shows the one and two-dimensional projections of the 18-dimensional posterior distribution for all but the six nuisance parameters of the temperature structure (see the left panel of Fig. 3 for the P-T confidence envelopes). M_P,spec is the mass of HR 8799e in units of Jupiter masses, derived from the retrieval posterior distributions of log (g) and R_P.