Corner plot (Foreman-Mackey 2016) displaying the posterior distribution of the parameters of the brightness profile fit shown in Fig. 12. The diagonal plots display marginalized posterior distributions of the individual parameters. The contours in the off-diagonal plots correspond to 1σ, 2σ, 3σ constraints on the joint probability distribution of two parameters. The units of the parameters A, C, and θ_D are erg s⁻¹ cm⁻², erg s⁻¹ cm⁻² arcmin⁻², and arcmin, respectively.