a) Galactic longitude-latitude map of the peak temperatures of the ¹³CO(1–0) data cube along the velocity axis. b) Galactic-longitude-velocity map of peak temperatures of ¹³CO(1–0) along the galactic latitude axis. c) Velocity-galactic-latitude map of peak temperatures of ¹³CO(1–0) along the galactic longitude axis. d)Spitzer GLIMPSE (Benjamin et al. 2003) and MIPSGAL (Carey et al. 2009) three-color image of the region. Red: 24 μm, Green: 8 μm, Blue: 3.6 μm. Overlaid contours are the velocity-integrated ¹³CO(1–0) emission from the Galactic Ring Survey (Jackson et al. 2006) (− 4.95 km s^-1 < v_lsr < 17.36 km s^-1). Contours correspond to 3.5, 7.3, 11.2, 15 K km s^-1. In a) b), and d), the bubble is indicated as a red ellipse.