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| Classification | Intensity criteria | Intensity range (a.u.) |
|---|---|---|
| Hole | 0 < Intensity < (μm− 5.1 σm) | 0–500 |
| Monolayer | (μm− 5.1 σm) < Intensity < (μm + 2.4 σm) | 500–1680 |
| Indeterminate | (μm + 2.4 σm) < Intensity < (μb—2.3 σb) | 1680–1880 |
| Bilayer | (μb—2.3 σb) < Intensity < (μb + 2.3 σb) | 1880–3308 |
| SUV | Intensity > (μb + 2.3 σb) | 3308–4096 |
