Similar to Fig. B.1 but towards G1.87−SMM 12, 14, 16. The contour levels start at 3σ for H¹³CO⁺, HN¹³C, C₂H, HC₃N, and CH₃CN. For SiO, HNCO(4_0, 4 − 3_0, 3), HCN, HCO⁺, HNC, and N₂H⁺, the contours start at 5σ, 15σ, 19σ, 10σ, 15σ, and 6σ, respectively. In all cases, the contours go in steps of 3σ. The average 1σ value in T_MB units is ~ 0.63 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 emissions of HNCO, HCN, HCO⁺, HNC, HC₃N, and N₂H⁺ are extended in a similar fashion, but the HNCO emission is clearly the strongest.