for too many times i have seen wrong usage of terms like VLF,ELF and similar. As a matter of fact it you go and look over the web in articles connected with VLF, you'll see that almost everyone uses different term for something that is ELF,or SLF or vice versa. in some article you will read that 4kHz is ELF, while the other article you'll read that 4kHz it is VLF. So where is this 4kHz anyway? And what is difference ELF,ULF and VLF?
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