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

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Text this: Effects of heterogeneous variance on X̄ chart