أرسل هذا في رسالة قصيرة: Cumulative sum control chart for monitoring process variance

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