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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