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Fχ-values for for phonon fits when adding additional phonon peaks. The Fχ-values increase by including two and eventually three-phonon excitations and exceed the F-value indicating that the inclusion of the additional parameters improves description of the experimental data. F-values were taken from database [64].
| Fχ | F(2.5%) | |
|---|---|---|
| adding second phonon | 94.25 | 6.41 |
| adding third phonon | 17.94 | 6.04 |
