Corner plot of the posterior distribution for parameters of CAL 83. The 2D contours correspond to 39.3%, 86.5%, and 98.9% confidence levels. The histograms show the normalized 1D distributions for a given parameter derived from the posterior samples. The best-fit parameter values are presented in Table 2. A Gaussian prior for the hydrogen column density N_H was used, with μ = 6.5 × 10²⁰ cm⁻² and σ = 1.0 × 10²⁰ cm⁻².