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How can i get the radial frequency and the fourie index after FFT?

Hi:

 

 

   I have a 2D array of real,after FFT I get  a 2D array of complex.

 

   the question is how can i get the  radial frequency and the fourie index from the complex number?  Mybe the question is so easy,  but i am so confused.  please help me!

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