Fig. A.2
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Channel-wise column density spectra (dN/dυ) as a function of velocity toward G19.61−0.23 and G31.41+0.31 The dN/dυ in each panel shows HCO+, HCN, HNC, CS, H2S, C2H, and c-C3H2 from top to bottom. The gray shaded area indicates dispersion of HCO+ emission lines from continuum sources, and the blue shaded regions represent 2σ confidence intervals for the derived column densities (per velocity interval).
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