Table 3: Observed, beam averaged column densities of vinyl cyanide (C2H3 CN) and vinyl acetylene (C2H3 CCH).
  C2H3 CNa   C2H3 CCHa
Source $T_{\rm ex}$ N   $T_{\rm ex}$ N
  (K) (cm-2)   (K) (cm-2)
Orion KL 140 $1.9 \times 10^{14}$   [150] < $4.5 \times 10^{14}$
W51 e1/e2 [150] $1.6 \times 10^{14}$   [150] < $6.8 \times 10^{14}$
S140 [150] < $1.0 \times 10^{13}$   [150] < $2.4 \times 10^{14}$
W3(OH) [150] < $1.3\times10^{13}$     [150] < $2.1\times 10^{14}$
a Upper limits are taken at 3$\sigma$ noise-level over 10 km s-1,
assuming the $T_{\rm ex}$ given in square brackets.

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