Posterior probability distributions for pairs of the fitting parameters for the absorbed BB + BB + brPL fit of the optical-FUV + X-ray data with 68% and 95% percentile contours. Marginalized 1D parameter distributions are shown with the median parameter values and 68% credible intervals. The vertical dashed lines correspond to 68% and 95% percentiles of the distributions. The BB normalization is defined as K_BB = (R/10 km)²/(d/1 kpc)², and the brPL normalization K_PL is the photon flux of the low-energy component in units of 10⁻⁵ photons cm⁻² s⁻¹ keV⁻¹ at 1 keV (see the text for all the notations).