Text this: An efficient algorithm for computing smoothness indicators for WENO schemes

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