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             ___      _  _    _    _     ______  
    ___     / _ \\   | \| || | || | ||  /_____// 
   /   ||  / //\ \\  |  ' || | || | ||  `____ `  
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    -|_|| `-`   `-`  `-` -`    `---`    /_//     
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Text this: Closed-form eigenfrequencies in prolate spheroidal conducting cavity