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| abstraction > mathematical concept > number > quantity > radiation measurement > spectral feature > set of lines > set of molecular lines > P-branch | 
| P-branch comparison table | ||
| Subject | is a kind of | has definition | 
|---|---|---|
| set of molecular lines | set of lines | |
| P-branch | set of molecular lines | A set of lines in the spectra of molecules corresponding to unit increases in rotational energy. | 
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