Table 2: Total column densities derived using the LTE assumption (see the text). For the three cores in the "head'' appropriate velocity components were used (see Table 1). The formal errors are 10-15%, which include intensity calibration ($\sim $10%) and spectral noise.
\begin{table}
\par\par\begin{displaymath}
\hskip0.3cm \begin{array}{lcccccccc...
... components of the cores in the head are not resolved.
\end{list}
\end{table}

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