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

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Text this: Geometric criterion for RR↔MR transition in hypersonic double-wedge flows