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I found this image of an electron density profile.

ftp://ftp.ngdc.noaa.gov/ionosonde/data/RO041/individual/2021/046/image/RO041_2021046113000_EDP.PNG

However, the profile is expressed in terms of "plasma frequency" and not in terms of electron density which I assume would be something like electron/m3. Why is it so? Is there a one to one relationship with electron density?

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    $\begingroup$ Have you looked up how the plasma frequency is defined? $\endgroup$ Apr 27 at 16:42

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