Integrated intensity map of the ¹²CO J = 2–1 data for the blue cloud (the same as figures 4a and 4c), in which two components of the red cloud are shown by the white contours: the solid line indicates the position of the current observed cloud and the dashed line indicates the position with a 1 pc displacement toward the positive longitude direction. The black cross indicates the O star and yellow and white crosses indicate the class 0/I and I/II objects (Bik et al. 2010), respectively.