Table 1: Observed and derived physical parameters.

Velocity interval (km s-1)		 -50 to -40
Systemic velocity (km s-1) $-45 \pm 2$
Kinematical distance (kpc) $3 \pm 0.6$
Expansion velocity (km s-1) 7
Average angular radius of the HI shell (arcmin) 25
Linear radius of the HI shell (pc) 22
Missing HI  mass ($M_\odot$) $\sim$1200
Shell HI mass ($M_\odot$) $\sim$1950
Swept-up HI mass ($M_\odot$) $\sim$1600
Dynamical age (yr) $1.7 \times 10^{6}$
Kinetic energy (ergs) $8 \times 10^{47}$


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