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Table 1

Fit parameters to the observed lines

Molec.     ν     N     Δv1/2     T MB     ∫TMBdv
    (GHz)     (× 1013 cm-2)     (km s-1)     (mK)     (mK km s-1)
CCHa     87.317     33 (5)     130 (30)     0.9     300 (40)
HCN     88.630     2.1 (0.3)     185 (30)     1.5     290 (40)
HCO+     89.188     1.10 (0.18)     163 (30)     1.5     260 (40)
HNC     90.663     0.47 (0.12)     90 (30)     0.7     70 (20)

Notes. All lines were centred at 1770 ± 15km s-1.

(a)

Integrated intensity refers to the whole CCH hyperfine group, while the other parameters refer to the brightest component.

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