ALMA band 6 CO v = 0 J = 2-1 zeroth moment maps of five red supergiants in RSGC1: F01 (upper left), F02 (upper right), F03 (middle left), F04 (middle right), and F13 (bottom left). The ordinate and co-ordinate axis give the offset of the right ascension and declination, respectively, with respect to the input coordinates for the ALMA observations (see columns 2 and 3 in Table A.1). The ALMA synthesised beam is shown as a white ellipse in the lower right corner of each panel. The contours (in orange) show the CO emission at [3, 5, 10] times the rms value. The cyan circle has a diameter of size 1″ and is centred on the peak of the continuum emission.