Similar to Fig. B.1 but towards the filamentary IRDC G11.36. The contour levels start at 3σ in all cases except for N₂H⁺, where they start at 5σ. In all cases, the contours go in steps of 3σ. The average 1σ value in T_MB units is ~ 0.74 K km s^-1. The LABOCA 870 μm peak positions of the clumps are marked by red plus signs. A scale bar indicating the 1 pc projected length is indicated. The HCN and HCO⁺ appear to concentrate towards SMM 5, while HNC, and particularly N₂H⁺, trace the filamentary 8 μm absorption feature.