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            ______    ____      ______   _    _   
    ___    /_   _//  |  _ \\   /_   _// | \  / || 
   /   ||   -| ||-   | |_| ||   -| ||-  |  \/  || 
  | [] ||   _| ||_   | .  //    _| ||_  | .  . || 
   \__ ||  /_____//  |_|\_\\   /_____// |_|\/|_|| 
    -|_||  `-----`   `-` --`   `-----`  `-`  `-`  
     `-`

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Text this: Vertical directivity of train noise