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Use `what='mur_lc_t'`. The Helmholtz (or Gibbs at finite pressure)
free energy is shown as a function of temperature in the file
`output_anharm.ps`. Note that the absolute value of this energy
depends on the pseudopotentials as the total energy. You can however
compare the free energies for different crystal structures
and predict if a phase transition occurs and at which temperature (also
as a function of pressure).

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2024-02-14