Comparison of the HCN, HCO+, and H13CO+(1–0) spectra averaged over the observed area in a) Aquila/W40; b) Aquila/Serp–South; c) Aquila/cold; d) Oph/main; e) Oph/cold; f) Orion B/NGC 2023; g) Orion B/NGC 2024; h) Orion B/NGC 2068; and i) Orion B/NGC 2071. In each panel, blue, red, and gray lines show the mean HCN, HCO+, and H13CO+(1–0) spectra in the corresponding subregion; the vertical dashed line marks the peak velocity of the H13CO+(1–0) line.
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