Herschel 250 µm map of the Taurus filament. The model fits are compared mainly to the data inside the cyan contour (“filament region”), which corresponds to 10 MJy sr⁻¹ in the background-subtracted 350 µm map. The circles labelled A-C correspond to selected small regions, in order of increasing column density, that are used in the model comparisons. The white circle shows the area used for background subtraction.