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  Copyright (c) 2020 Philipp Le
  
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Following files are subject to the Creative Commons Attribution-Share Alike
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chapter01/Electromagnetic-Spectrum.svg, by Inuctiveload, URL:
https://en.wikipedia.org/wiki/File:EM_Spectrum_Properties_edit.svg

chapter01/EM_Spectrum_Properties_edit.svg, by Penubag and Viktor Blacus, URL:
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chapter02/Rainbow.jpg, by Arz, URL:
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chapter03/Comparison_convolution_correlation.svg, by Cmglee, URL:
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