Comparison of the HCO+ (1–0, red), HCN (1–0, blue), H13CO+ (1–0, black), and H13CN (1–0, orange) spectra averaged over the observed area in each AV range for 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, the vertical grey line marks the peak velocity of the H13CO+ line toward the 16 ≤ AV area, and the spectra shown from top to bottom correspond to the 16 ≤ AV, 12 ≤ AV< 16, 8 ≤ AV< 12, and AV< 8 areas, respectively.
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