Profiles of TMC-1N filament derived by using methods C and D in WFCAM data (top frame) and 2MASS data (bottom frame). Blue stars: median values. Grey line: Plummer profile before convolution, fitted to the median A_V values of stars. Black solid line: the convolved Plummer profile. Red solid line: fit to individual stars (not marked in the picture). Dashed lines: fitted linear baselines for Plummer fits shown with the same colours.