Polar histogram of the relative orientation between the oriented angles of the column density and the velocity gradients from the ¹³CO (1–0) (left) and the C¹⁸O (1–0) (right) emission for the different sub-regions of interest within the Orion B cloud. The different colors correspond to the column density thresholds. For ¹³CO (1–0): data with are shown in cyan, in blue, in blue-violet, in purple, and in fuchsia. For C¹⁸O (1–0): data with are shown in cyan, in blue, in purple, and in fuchsia. The colored bars at 10° show the error bars of the histograms.