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| H ii regions (1) |
| ISM: clouds (1) |
| ISM: molecules (1) |
| ISM: structure (1) |
| stars: formation (1) |
| stars: protostars (1) |
| H ii regions (1) |
| ISM: clouds (1) |
| ISM: molecules (1) |
| ISM: structure (1) |
| stars: formation (1) |
| stars: protostars (1) |