how can i plot power spectrum in the following picture?

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poshan reddy on 6 Jun 2014

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Answered: Image Analyst on 6 Jun 2014

1-s2.0-S0273117713004754-gr1.jpg

how can i plot this kind of pic? using a radar data?

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Image Analyst on 6 Jun 2014

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To me it looks like they turned it into an image and used image() or imshow() and then applied a colormap and colorbar. Can you ask the authors?

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