Input filaments missed by the segmentation process on the l = 160–171° (top) and l = 349–356° (bottom) regions of the Galactic plane, respectively. We show. The input filament mask (left) and the missed structures at a classification threshold of 0.8 in a cumulative way (for all the scenarios; right). The unit (color-coding) for the missed structures maps corresponds to the number of tested scenarios (from 1 to 7) that missed a given structure.