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| German | English |
| negativer Zweig | P-branch (rotation-vibration spectrum) |
| P-Zweig | P-branch (rotation-vibration spectra) |
| positiver Zweig | R-branch (rotation-vibration spectrum) |
| Q-Zweig | Q-branch (rotation-vibration spectra) |
| R-Zweig | R-branch (rotation-vibration spectrum) |
| Zweig des Interferometers | branch of the interferometer |
| Zweig einer Bande | branch of a band |