Different scale WISE images at 12 μm in RCW 33, 32, and 27 in the left, middle and right panels, respectively. YSOs selected with classical methods (upper panels) and M-type YSOs in different age ranges (lower panels) are overplotted with yellow squares and red, blue, and green points, respectively. Orange empty squares indicate the position of the ionizing stars, and red crosses and pluses correspond to C18O clouds 14 and 15 and to SFO sources, respectively.
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