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| Scattering Regime | Scatterer Size | Particle-Size Signature |
|---|---|---|
| Rayleigh | ka ≪ 1 (small) | None/weak |
| ka ∼ 1 (intermediate) | Form factor: low-f curvature (rms size only) | |
| Mie | ka > 1 (large) | Form factor: higher frequencies (size and shape) |
