Fig. 9.
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Fiducial model for the tentative HCO+ band at 12.1 μm. This model has a temperature of T = 50 K, a column density of N(HCO+) = 5×1015 cm−2, a velocity dispersion of σV = 75 km s−1, and a background fraction of fbg = 0.28, matching that found for HCN and C2H2 at 14 μm. The detected ν4 band of protonated hydrogen cyanide is indicated as well.
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