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  ______   __   __   _    _     ______    ______  
 /_   _//  \ \\/ // | \  / ||  /_   _//  /_   _// 
   | ||     \ ` //  |  \/  ||   -| ||-     | ||   
  _| ||      | ||   | .  . ||   _| ||_    _| ||   
 /__//       |_||   |_|\/|_||  /_____//  /__//    
 `--`        `-`'   `-`  `-`   `-----`   `--`

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Text this: Asymmetric transmission and optical low-pass filtering in a stack of random media with graded transport mean free path