Table 2: Velocity measurements.
Line $V_{\rm LSR}$ (km s^-1) Reference

H $\alpha$ -39.5 Pismis et al. (1991)

H $\alpha$ -43.9 $\pm$ 0.1 Fich et al. (1990)

H109 $\alpha$ -40.1 $\pm$ 1.0 Lockman (1989)

CO -35.3 $\pm$ 0.3 Blitz et al. (1982)

CO -34.3 Shepherd & Churchwell (1996)

**Table 2:** Velocity measurements.
Line	$V_{\rm LSR}$ (km s^-1)	Reference
H $\alpha$	-39.5	Pismis et al. (1991)
H $\alpha$	-43.9 $\pm$ 0.1	Fich et al. (1990)
H109 $\alpha$	-40.1 $\pm$ 1.0	Lockman (1989)
CO	-35.3 $\pm$ 0.3	Blitz et al. (1982)
CO	-34.3	Shepherd & Churchwell (1996)

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