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

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Text this: Flow field analysis of columnar vortex