FARGO3D

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This parameter can be set either to `FARGO` or to `STANDARD` to define which kind of azimuthal advection algorithm has to be used. In the `STANDARD` case, the azimuthal advection is performed in a standard way, and the CFL criterion includes the full azimuthal velocity. In the `FARGO` case, the FARGO algorithm described in Masset (2000) is applied, which relieves the CFL condition and allows a much larger time step and a faster calculation. The `Transport` parameter defaults to `FARGO`. It can be set to `STANDARD` for comparison and benchmarking purposes.

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