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

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Text this: Numerical solution of the Helmholtz equation with high wavenumbers