Text this: Surface composition of MAPb(I <inf>x</inf> Br <inf>1−x</inf> ) <inf>3</inf> (0 ≤ x ≤ 1) organic-inorganic mixed-halide perovskites

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