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Use `what='scf_ph'`. See `example16` and `example20`.
Please note that this calculation is made by the extended version of the
phonon code available in THERMO_PW, so you have to provide specific flags
to the phonon input. See the user's guide for details.
The dielectric constant is in the file `output_epsilon.ps`.
Note that for metals you need to specify a finite wave-vector **q** and you
cannot plot the dielectric constant when **q** is the
1#1
point.
See `example17` and `example21` for this case.

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2023-05-05