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Table 2

Observed line ratios.

Species Ratio
J = 1–0a J = 4–3

HCN/HCO+ 0.9 0.56
HCN/HNC 1.0 3.7

Species Ratio J = 4–3/J = 1–0

HCN 0.73
HCO+ 1.25
HNC 0.22

Notes. Ratios of velocity-integrated line intensities between species in the J = 1−0 and J = 4−3 transitions (upper table) and between the J = 4−3 and J = 1−0 transition for each of the main species (lower table). The integrated line intensities have been measured in a 67′′ diameter aperture centred on the peak of the emission.

(a)

IRAM 30 m data from Peng & Wyrowski, priv. comm.

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