¹²CO velocity channel maps of the 27 km s^-1 cloud. Each panel consists of the intensity integrated over a 1.0 km s^-1wide range, and the velocity, in km s^-1, is labeled in the upper left corner of each panel. The HII region S287, the stellar association Mon OB3, and the open cluster NGC 2311 are marked with a white ellipse and pentagrams, and their names are also given in the upper left panel. The color bar represents integrated intensities in units of K km s^-1.