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| Galaxy: structure (1) |
| ISM: clouds (1) |
| ISM: H II regions (1) |
| radio continuum: ISM (1) |
| Stars: early-type (1) |
| stars: formation (1) |
| Galaxy: structure (1) |
| ISM: clouds (1) |
| ISM: H II regions (1) |
| radio continuum: ISM (1) |
| Stars: early-type (1) |
| stars: formation (1) |