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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 |
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| 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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