Table 2: Estimates of the \ensuremath {{\rm HCN}}(J=1-0) excitation temperatures and the \ensuremath {{\rm HCN}} column densities towards selected positions using hyperfine structure fits. The coordinates are offsets from the position of Cha-MMS1a.
$\Delta\alpha$ $\Delta\delta$ $T_{\rm ex}$ $\tau_{\rm main}$ $\Delta v$ $N({\rm HCN})$
( $\hbox{$^{\prime\prime}$ }$) ( $\hbox{$^{\prime\prime}$ }$) (K)   (km s-1) (cm-2)

40		 20 5.2+1.0-0.6 $1.1~\pm0.3$ $0.49\pm0.30$ $4.7\times 10^{12}$
-50 -10 5.3+2.7-1.0 $0.9~\pm 0.4$ $0.58\pm0.07$ $4.6\times 10^{12}$
10 -10 5.6+3.0-1.2 $0.7~\pm 0.3$ $0.56\pm0.08$ $3.8\times 10^{12}$
70 20 5.4+7.0-1.5 $0.5~\pm 0.3$ $0.49\pm0.04$ $2.0\times 10^{12}$


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