(a) Velocity‐integrated map of the ¹²CO emission integrated over ﹩150\leq V_{\mathrm{LSR}\,}< 350﹩ km s⁻¹. The contours are at 1.2 (3 σ noise level), 3.6, 6.0, 8.4, 12.0, and 15.6 K km s⁻¹. The thin lines show the observed region, and the cross indicates the center determined from the kinematics of the H I observations by Kim et al. (1998). (b) Velocity‐integrated map of the ¹²CO emission superposed on an optical image. The three lowest contours from 1.2 K km s⁻¹ with 2.4 K km s⁻¹ intervals are shown so as not to mask the optical features.