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  ______    ______   _    _      ___       _____  
 /_   _//  /_   _// | \  / ||   / _ \\    / ___// 
 `-| |,-    -| ||-  |  \/  ||  / //\ \\   \___ \\ 
   | ||     _| ||_  | .  . || |  ___  ||  /    // 
   |_||    /_____// |_|\/|_|| |_||  |_|| /____//  
   `-`'    `-----`  `-`  `-`  `-`   `-` `-----`

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Text this: Tools of Radio Astronomy (Fifth Edition)