CO(2−1) emission toward NGC 602 (black contours at levels 0.4, 0.5, 0.6, 0.9, 1.3, 1.7, and 2.1 K kms⁻¹) superimposed to the Spitzer 8 µm, MCELS Hα, Herschel 160 µm, and AzTEC 1.1 mm maps. The IDs of the three clouds correspond to Table 2. The evolutionary classification of YSOs from Carlson et al. (2011) are indicated by red (Stage I), green (Stages I-II and II), and blue (Stages II-III and III) circles. The largest yellow square represents the main stellar cluster, and the smaller squares indicate PMS subclusters (see Gouliermis et al. 2012) associated with the CO emission.