Posterior probability distributions of the fit parameters (yellow histograms) of the φ Persei system together with a fitted Gaussian curve (in black). For comparison, the observed parameters for the φ Persei system (bluevertical dashed lines) and their 1 σ uncertaintyintervals (blue shaded regions) are shown. Top panels: current masses of the sdO and Be star, M_SES and M_Be. Central panels: effective temperatures, T_{eff, SES} and T_{eff, Be}. Bottom panels: present-day orbital period P_orb and the ratio of their radii R_SES∕R_Be.