Upper left and right and lower left: integrated intensity maps in the ¹²CO(1–0) line obtained with the BEARS instrument at the NRO 45-m telescope. The signal was integrated in the velocity range indicated on each map. Contours are drawn for 30, 45, and 60% of the maximal integrated signal. Lower right: the noise-level distribution in the ¹²CO(1–0) data cube (rms values are given per 0.1 km s^-1 bin). Dashed lines are drawn for constant declination and right ascension. Note that the frames are not aligned with the axis of the equatorial system. The star marks the position of V838 Mon.