Table 2: Derived parameters for the four components shown in Fig. 7. The parameters include mean values for the excitation temperature ( $\overline {T}_{{\rm ex}}$); the 13CO(2-1) optical depth ( $\overline {\tau }_{^{13}{\rm CO}}$); and the 13CO and H2 column densities ( $\overline {N}(^{13}$CO), $\overline {N}({\rm H}_2$), respectively). Also listed are the corresponding estimates for the LTE mass (M $_{{\rm LTE}}$), Virial mass (M $_{{\rm vir}}$) and average H2 volume density ( $\overline {n}_{H_2})$
  $\overline {T}_{{\rm ex}}$ $\overline {\tau }_{^{13}{\rm CO}}$ Area $\overline {N}(^{13}$CO) $\overline{N}({\rm H}_2)$ $M_{{\rm LTE}}$ $M_{{\rm vir}}$ $\overline{n}_{{\rm H}_2}$
  (K)   (degrees2) (cm-2) (cm-2) ($M_\odot$) ($M_\odot$) (cm-3)

(a) -25 to -22 km s-1

 30 0.45 $2.1 \times10^{-3}$ $2.0 \times10^{16}$ $8.4 \times10^{21}$ 540 420 $1.5 \times10^{3}$
(b) -21 to -19 km s-1 31 0.49 $1.3 \times10^{-3}$ $1.5 \times10^{16}$ $6.5 \times10^{21}$ 260 1300 $1.5 \times10^{3}$
(c) -18 to -14 km s-1 29 0.27 $1.7 \times10^{-3}$ $1.5 \times10^{16}$ $6.5 \times10^{21}$ 310 380 $1.1 \times10^{3}$
(d) -13 to -10 km s-1 17 0.2 $0.5 \times10^{-3}$ $0.6 \times10^{16}$ $2.7 \times10^{21}$ 40 540 $0.2 \times10^{3}$


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