Normalized intensity profile of the 870 μm emission from filament D (black line). The solid yellow line indicates the beam profile. The red solid line represents the best fit to the intensity profile. Left-hand panel: radial intensity profile of the emission from the clumps. Its shape can be well fitted by a profile with p = 4 (hydrostatic solution; green dashed line). Right-hand panel: intensity profile of emission from the interclump material. Its shape can be well fitted by a profile with p = 2 (magnetic solution; green dotted line).