Modified black-body fit to the combined SPIRE and SCUBA-2 data at 15′′ resolution, using SCUBA-2 data as a constraint only over the main filament. Panels a–c: the fitted 250 μm surface brightness, the colour temperature, and the estimated column density, respectively. Panels d–h: the residuals relative to the observed, background-subtracted surface brightness values at 250, 350, 500, 450, and 850 μm, respectively. The fits used β = 1.8. The contours are drawn at T = 13.5 K and N(H₂) = 2 × 10²² cm⁻².