Left: Herschel column density map of filament 14 in IC 5146 corresponding to the yellow rectangle in Fig. 1, in units of visual extinction (A_V) where N_H2 ~ A_V    ×    10²¹ cm^-2. The resolution of the map is 36.9″. The black contours correspond to column densities of 1 and 2    ×    10²¹ cm^-2. These contours are reproduced in the middle and right panels. Middle: ¹³CO(2−1) integrated intensity map (in units of K km s^-1) over the LSR velocity range  − 2.5 to 1 km s^-1. The map has been smoothed to a resolution of 18.5″, which corresponds to half the resolution of the Herschel column density map. The ¹³CO(2−1) integrated emission of the filament is concentrated within the 10²¹ cm^-2 column density contour, which traces the elongated structure of the filament. Right: same as the middle panel for the C¹⁸O(2−1) transition.