| Spectral region | Calibration model | Validation model | ||
| Wavenumber (cm−1) | R2 | RMSE | R2 | RMSE |
| 12000.0 - 4000.0 | 98.27 | 0.201 | 62.41 | 1.99 |
| 9048.6 - 4026.7 | 99.81 | 0.196 | 70.67 | 1.87 |
| 8000.0 - 4000.0 | 99.81 | 0.195 | 69.48 | 1.90 |
| 7997.5 - 5971.1/5519.4 - 4508.9 | 99.83 | 0.177 | 52.33 | 2.38 |
| 7997.5 - 5971.1/5626.4 - 3999.7 | 99.81 | 0.191 | 69.11 | 1.91 |