Position-velocity diagrams in colour scale and contours, at z = 0.16 pc (top), z =  −0.06 pc (middle) and z =  −0.30 pc (bottom) for the turbulent direct and offset runs, A_T and B_T, left and right respectively. The contour levels and red crosses are as in Fig. 6. As expected from Fig. 6, the velocities are more complex in the A run than the observed ones. The top panels show that the direct collision (left) produces two velocity components in the northern part of the cloud, whereas the offset collision B (right) and the observations only show one (Fig. 2). From the middle and lower panels, the differences are less obvious, but the middle panel shows that the direct collision exhibits a more “messy” velocity structure rather than a clear transition from high to low velocities.