Total linear mass density (M_line,tot) as a function of radial distance from the filament crest for a Plummer-like function (solid black curve) with R_flat = 0.10 ± 0.01 and p = 2.9 ± 0.2, relative to a Gaussian with FWHM = 0.18 ± 0.02 pc (dot-dashed red curve). Changes in the M_line,tot−R relation depend on the uncertainties in the Plummer parameters R_flat and p (black dashed-lines). The Gaussian FWHM was defined as the point where an increase in Gaussian width overestimates the linear mass density of the inner parts of the Plummer function.