Detecting Electromagnetic Geographical Environment Changes Based on the Frequency-Intensity Curve

Table 4

Threshold of ID 393.

Frequency (Hz)	Electric field		Magnetic field		High-frequency electric field
	0~100 K	100 K~200 K	0~100 K	100 K~200 K	200 K~10 M	10 M~2 G
ε393	6.0886	4.5349	2.6687	0.0540	8.2055	4.9254