CO (2−1) emission (contours) northeast (upper panel) and southwest (bottom panel) of the explosive outflow at DR21, overlaid with the continuum map at 1.3 mm (grayscale). The colored contours indicate different velocity ranges: blue for velocities between −79 and −52 km s⁻¹, green for velocities between −51 and −24 km s⁻¹, and red for velocities between −31 and +69 km s⁻¹. The contours represent the CO (2−1) emission at 5, 10, 20, and 30 times the rms noise level of 70 mJy beam⁻¹ km s⁻¹. The possible origin of the CO streamers is marked with the yellow square. A redshifted collimated outflow is observed toward the southern edge of the image. The direction of this outflow (violet arrow) seems to indicate that it is associated with the continuum source MM5 (violet star). The synthesized beam of the continuum map is shown within a box in the bottom right corner.