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  ______     ___      ______    _____     ______  
 /_   _//   / _ \\   /_   _//  |  ___||  /_   _// 
   | ||    / //\ \\    | ||    | ||__    `-| |,-  
  _| ||   |  ___  ||  _| ||    | ||__      | ||   
 /__//    |_||  |_|| /__//     |_____||    |_||   
 `--`     `-`   `-`  `--`      `-----`     `-`'

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Text this: Optimal zone for bandwidth selection in semiparametric models