Integrated CO(2−1) emission toward N66, N83, DarkPK, and NGC 602. The beam width of 30″ (~9 pc at the SMC distance) and the integrated velocity range are shown at the bottom of the left panels of each region. The CO contours in the right panel of N66 are at 1.6, 2.6, 4.0, 5.7, 8.6, 11.4, and 14.3 K kms⁻¹. In N83, the contours are at 1, 3, 7, 10, and 15 K kms⁻¹. In DarkPK, the CO contours take values of 0.5, 1.5, 3.0, and 6.0 K kms⁻¹. In NGC 602, the contours take values of 0.4, 0.5, 0.6, 0.9, 1.3, 1.7, and 2.1 K kms⁻¹. All of these contours were determined with the moment mask method (see Sect. 4).