Width calculation procedure: (a) A zoom-in region cut from the column-density map with the extracted filament skeletons. The blue line represents a slice perpendicular to the skeleton. b) The original density distribution along the slice. (c) The density distribution smoothed with a Gaussian kernel of our beam size (18.4″) and then baseline subtraction. (d) Identify the peak. (e) Determine the minima nearest to the peak. (f) Gaussian fitting within the constraints determined in the previous step.