Histogram of the relative velocity (left) and number of pairs as a function of the MOP (right) between associated GMCs and H II regions for all galaxies in the sample. One GMC–H II region pair is present in this histogram when at least one pixel is overlapping. The mean, median, and standard deviation of the overlap distribution are listed on the top right corner. The vertical dashed lines in the right panel represent the 10%, 40% and 70% MOP.