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Summary of magnetic and HRV frequency ranges used in measurements.
| Measurement frequency ranges | |
|---|---|
| Hz | |
| Schumann resonance power | 3.5–36 |
| Magnetic field ULF power | 0.002–3.5 |
| HRV | |
| Total power | 0–0.4 |
| Very low frequency | 0.003–0.04 |
| Low frequency | 0.04–0.15 |
| High frequency | 0.15–0.4 |
