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Average Mahalanobis distance (AMD) of the spectra with different resolutions and for five scans
| Spectral collecting condition | AMD |
| Spectrum resolution (cm−1) | |
| 2 | 1.154 |
| 4 | 1.015 |
| 8 | 0.485 |
| 16 | 0.823 |
| Number of repetition | |
| 16 | 1.055 |
| 32 | 1.006 |
| 64 | 0.473 |
| 128 | 0.400 |
