Changes in the χ1 and χ2 angles of Y121, F330, and W84, and in the distance of TChC from its starting position, in two trajectories taken from simulation group III. (A) Changes in the χ1 and χ2 angles of Y121 and F330 during exit of ThCc along the gorge axis. (B) Change in the χ1 and χ2 angles of W84 during exit of ThCc through the back-door. Black traces show χ1 angles and red traces show χ2 angles. The colored bars in panels A and B mark the simulation times at which the snapshots shown in Figs. 5 and 6, respectively, were taken.