發送短信 : A simple graphical approach for comparing reliability trends of different units in a fleet

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