Table 3: Column densities towards the \ensuremath {{\rm HN^{13}C}} maximum derived using the LTE method. The assumed value for $T_{\rm ex}$ is 5.2+1.0-0.6 K.   a The intensity value is for the weakest hyperfine component F=0-1 which comprises one ninth of the total intensity of the J=1-0 line.

Molecule		 $\int T{^*}{_{\rm A}} {\rm d}v$ $N_{\rm tot}$
  ( ${\rm K~km~s^{-1}}$) ( ${\rm cm}^{-2}$)

\ensuremath {{\rm HCN}} a		 $0.37\pm0.03$ $(8.8\pm 1.0)\times 10^{12}$
\ensuremath {{\rm HNC}} b $1.17\pm0.03$  
\ensuremath{{\rm H^{13}CN}} $0.19\pm0.03$ $(5.2~\pm 0.1)\times 10^{11}$
\ensuremath {{\rm HN^{13}C}} $0.52\pm0.02$ $(1.7~\pm 0.2)\times 10^{12}$
\ensuremath{{\rm H^{15}NC}} $0.07\pm0.01$ $(2.3~\pm 0.5)\times 10^{11}$
b A column density estimate is not given because
of the obvious large optical thickness.

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