Distributions of distances between YSOs and their nearest filaments; also shown as the percentage of sources at each distance for different evolutionary types. From top to bottom, the panels show CLASS I, Class FS, CLASS II, and CLASS III, respectively The bin size is 0.5 pc, which is the typical width of the filaments in Cygnus X. There is a clear trend of YSOs gradually moving away from the nearest filament with the evolution.