Integrated intensity contours of the CO (1–0) line of the blueshifted and redshifted clouds superimposed on the RGB image with 24 μm (red), 8.0 μm (green), and 4.5 μm (blue). The CO (1–0) data is from Zhang et al. (2013). The integration range is from −14.5 to −11.5km s^-1 for the blueshifted cloud, and from −9.5 to −6.5km s^-1 for the redshifted cloud. The symbols “■”, letters (A, B, ..., and I), and ellipse indicate the positions of eight IRAS point sources, nine molecular clumps, and ring-like shell of the bubble, respectively.