Contribute correction: MST Calc - Spreadsheet

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