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Table 2

Evolutionary sequence of star forming regions in W33 derived from continuum and maser observations.

Source Submillimeter Infrared Maser Radio Evol. Stage

W33 Main1 weak High-mass protostellar object
W33 A1 weak High-mass protostellar object
W33 B1 weak High-mass protostellar object
W33 B weak Hot Core
W33 A Hot Core
W33 Main H ii region

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