Contribute correction: MST Calc - Spreadsheet

  _  _    _    _    _    _     ______  
 | \| || | || | || | \  / ||  /_   _// 
 |  ' || | || | || |  \/  ||   -| ||-  
 | .  || | \\_/ || | .  . ||   _| ||_  
 |_|\_||  \____//  |_|\/|_||  /_____// 
 `-` -`    `---`   `-`  `-`   `-----`