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

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Text this: Energy shift correction for the reflection approximation