Mass determinations for different datasets and choices of priors. In black: the posterior from the RV analysis with the FENRIR two modes – four harmonics – Matérn 1/2 model (see Appendix D). The blue posteriors are from the photo-dynamical model alone, while the green posteriors are from the joint photo-dynamical and RV fits. The ‘default’, ‘high-mass’, and ‘final’ set of priors are defined in Sect. 3.2. The cyan posterior synthesise the best fits of all our models with additional planets in the resonant chain, see Appendix E. The photodyn ‘final’ and photodyn+RV ‘final’ are the cases reported in Tables 2 and 3.