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Table 4
Summary of components for H2O emission from IRAS 4B.
| Emission source | Probe | Line profile | Opacity | Location |
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| Compact disk | sub-mm H O |
Narrow, symmetric | optically thick | on-source |
| Off-source outflow | mid/far-IR H2O | Unresolved | optically thin | off-source |
| Maser emission | mm H2O | Narrow | high density | off-source |
| On-source outflow | far-IR H2O | Symmetric | optically thin | on-source |
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| Disk-envelope shock? | (sub)-mm? | Narrow (if present) | optically thick | on-source |
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