Same as Fig. 8 but for a double absorption line. The upper left panel shows the true versus predicted values stacking b₁ and b₂. Similarly, the upper middle panels show column density. The right upper panel shows the velocity difference between the two absorption lines. The middle panels show the histogram of the difference between true and predicted values, with 90% and 68% values marked at the top for component 1 (red color) and component 2 (blue color) of the double absorption line. The lower panel shows the normalized histogram of true and predicted parameters.