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

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Text this: Integration over the u-plane in Donaldson theory with surface operators