Submillimetre Array ¹²CO (upper row) and ¹³CO (lower row) J = 2–1 line observations (red contours) integrated over 2.4 km s⁻¹ wide velocity intervals and plotted over the SCUBA-2 observations at 850 μm. The numbers in the lower left corner show the centre of the velocity bin and the numbers at the top show the maximum intensity of the bin. The beam size is indicated by the blue ellipse in the lower right corner. The white crosses show the location of the three compact sources.