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1.9 How do I calculate the vibrational energy, free energy, entropy, and heat capacity?

Use what='scf_disp'. See example04. These quantities are calculated after the phonon dispersion for the default temperature range ( 1 K - 800 K) or for the range given in the THERMO_PW input. The figure of these quantities is in the file Note that they are calculated at the geometry given in the input of pw.x.