Head-tail vectors as a function of Galactic coordinates. We have differently marked clouds where v_head < v_tail (because all clouds move with negative radial velocities, this means that the tail moves slower toward the observer than the head) and v_head > v_tail. In some cases the velocity fields did not show a clear sign of a separation. The length of each vector indicates the separation of the head and tail but was scaled with a factor of ten for improved visualization.