Dependence of the measured HP diameter, HP_obs, on spatial resolution (lower x axis) or, equivalently, distance (upper x axis) for the Taurus B211/3 filament at various resolutions as given in Table A.1 (filled blue diamonds with error bars: simple hd estimates; open green diamonds: deconvolved estimates) and other filaments from the HGBS. The black symbols and error bars show the median value and interquartile range of the filament widths measured in each of eight HGBS clouds by Arzoumanian et al. (2019). The light brown symbols show deconvolved width estimates for the most distant clouds, based on the results of the Plummer tests of Sect. 3 assuming p = 1.7. One cloud (IC5146) spans a significant range of distances according to Gaia data and is represented by two connected black and brown symbols.