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

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Text this: Source term treatment of SWEs using surface gradient upwind method