Plummer fits for selected cross-sections of the OMC-3 filament segment A. The three frames correspond to the MIR, HR, and AR column-density maps, respectively. Each frame shows individual profiles for the offsets Δy = 10, 20, 30, and 40 arcsec (cf. Figs. 3–5; blue, cyan, red, and grey lines, respectively) and the median profile (thick black lines). The best-fit Plummer profiles are plotted with dashed lines of the same colour, and R, p, and FWHM values of the fits are listed in the frames.