Complementary |${^{12}\rm{CO}(J = 2-1)}$| distributions of the |$-39\:\rm{km\:s^{-1}}$| and |$-42\:\rm{km\:s^{-1}}$| clouds. The integration velocity range is from |$-45.5$| to |$-42.0\:\rm{km\:s^{-1}}$| for the color image; |$-40.5$| to |$-37.0\:\rm{km\:s^{-1}}$| for the contours. The lowest and the intervals of superposed contours are 11.7 and |$15\:\rm{K\:km\:s^{-1}}$|⁠, respectively. The magenta crosses, white cross, and dots indicate the positions of BD |$+$|61 411, IRS 2, a driving source of the OH maser, and well-known OB stars (e.g., Navarete et al. 2019).