CYGNUS X NORTH (DR21): Left: LOS corrected column density map in visual extinction. The image is rotated and a length scale is given in the panel. For the cloud N-PDFs with two PLTs, the contour of the second DP is plotted in black. Right (lower panel): ∆-variance spectrum. X-axis units are arcmin (bottom) and parsec (top). The black dashed line indicates the angular resolution (18″), the first red dashed line indicates the upper limit for the fit of β₁ (the lower limit is the resolution limit) and in case there are two fitting intervalls, two other red dashed lines indicate the fit range for β₂. The values of β₁ and β₂ are given in the panel. The errors are omitted for better visibility, they are always on the order of 0.01 to 0.03. Right (top panel): N-PDF of LOS corrected column density in black, expressed in visual extinction (upper x-axis) and in η (lower x-axis). For comparison, the N-PDF of the uncorrected map is displayed in blue. The slope s of the PLT, the width σ (expressed in η) of the log-normal part of the (corrected) N-PDF, and the deviation point DP (expressed in A_V) are given in the panel.