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Table 1:

Observed line parameters of CN-.
  $\nu_{\rm0}$a $\nu_{\rm obs}$ $v_{\rm exp}$b $\int$ $T_{\rm A}^*$${\rm d}$v
Transition (MHz) (MHz) (km s-1) (K km s-1)

J = 1-0
112 264.8 112 264.8c 14.5c $\sim$0.07(3)d
J = 2-1 224 525.1 224 525.4(5) 14.5c 0.23(7)e
J = 3-2 336 776.4 336 777.0(12) 15.0(10) 0.13(2)

Notes. Number in parentheses are 1$\sigma$ uncertainties in units of the last digits. (a) Frequencies derived from the rotational constants reported by Amano (2008). (b)  $v_{\rm exp}$is the half width at zero level. (c) Fixed value. (d) Highly uncertain estimate. Line severely blended with a strong C6H line. (e) Line blended with a SiC2 $\nu _3=2$ line.

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