Corner plot (Foreman-Mackey 2016) showing the one and two dimensional projections of the posterior probability distributions of the model parameters of CN. On top of each column the probability distribution for each free parameter is shown together with the value of the best fit and the corresponding left and right errors. The left and right dashed lines indicate the lower and upper limits of the corresponding HPD interval, respectively. The dashed line in the middle indicates the mode of the distribution. The blue lines indicate the parameter values of the best fit. The plots in the lower left corner describe the projected 2D histograms of two parameters and the contours the HPD regions, respectively. In order to get a better estimation of the errors, we determine the error of the column density on log scale and use the velocity offset (v_off) related to the source velocity of v_LSR = 64 km s⁻¹.