CO(2−1) emission toward N66 (black contours at levels 1.6, 2.6, 4.0, 5.7, 8.6, 11.4, and 14.3 K kms^-1) superimposed to the Spitzer 8 µm (left), MCELS Hα (middle), and AzTEC 1.1 mm (right) maps. An evolutionary classification of YSOs from Sewiło et al. (2013) and Simon et al. (2007) is indicated by red (Stage I), green (Stage II), and blue (Stage III) circles. The sizes of these circles are proportional to the stellar luminosity. The main cluster of N66 (NGC 346), the plume, and the bar structures are indicated. Yellow ″×″ symbols in the middle panel indicate the HII regions from Pellegrini et al. (2012). In the right panel, the 1.1 mm emission at 5σ is highlighted.