Table 4: Upper column density limits of amino acetonitrile (H2N CH2 CN) and oxiranecarbonitrile (c-C3H3 NO).
  H2N CH2 CNa   c-C3H3 NOa
Source $T_{\rm ex}$ N   $T_{\rm ex}$ N
  (K) (cm-2)   (K) (cm-2)
Orion KL [150] < $1.3\times10^{13}$   [40] < $3.4 \times 10^{12}$
W51 e1/e2 [150] < $3.5 \times 10^{13}$   [40] < $9.5 \times 10^{12}$
S140 [150] < $1.1 \times 10^{13}$   [40] < $2.3 \times 10^{12}$
W3(OH) [150] < $1.2 \times 10^{13}$     [40] < $2.3 \times 10^{12}$
a Upper limits are taken at 3$\sigma$ noise-level over 5 km s-1,
assuming the $T_{\rm ex}$ given in square brackets.

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