Keywords: user_guide

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## 4.4 DFPT with the tetrahedron method

In order to use the tetrahedron method for phonon calculations, you should run `pw.x` and `ph.x` as follows:

1. Run `pw.x` with `occupation = "tetrahedra_opt"` and `K_POINT automatic`.
2. Run `ph.x`.

There is an example in `PHonon/example/tetra_example/`.