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This example shows how to use pw.x to calculate phonons with a fully
relativistic US-PP which includes spin-orbit effects.
The calculation proceeds as follows:
1) make a self-consistent calculation for fcc-Pt
(input=pt.scf_ph.in, output=pt.scf_ph.out).
2) make a phonon calculation at the Gamma point (input=pt.ph.in,
output=pt.ph.out).
3) make a phonon calculation at X (input=pt.phX.in, output=pt.phX.out).
4) make a phonon dispersion calculation (input=pt.ph.in, output=pt.ph.out).
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