Histograms with velocities (in the x-axis) and the ratio between the total mass of C II, M_CII, and the initial cloud mass, M_cloud, 0 (in the y-axis), at the same times as in Fig. 3, t/t_cc = 0.2 (circles), 0.9 (triangles), 1.7 (stars), and 2.5 (diamonds). We use the same colour coding of Fig. 2, by showing in blue (left panel) the results from the simulation R32-AL and in red (right panel) the results from R32-TR. The dashed grey line refers to model R32-HD at t/t_cc = 1.7. In model R32-TR, at t/t_cc > 1.7, a larger fraction of C II mass reaches velocities > 100 km s⁻¹ than in R32-AL. Models R32-HD and R32-AL show similar trends, so transverse magnetic fields produce stronger kinematical effects on cold gas.