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real(dp) :: beta ! Inverse temperature for Chebishev expansion.
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real(dp) :: bulkm ! Bulk modulus
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real(dp) :: charnet ! Net electric charge
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real(dp) :: rijmin ! Min. permited interatomic distance without warning
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real(dp) :: dm_normalization_tol ! Threshold for DM normalization mismatch error
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logical :: normalize_dm_during_scf ! Whether we normalize the DM
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real(dp) :: dt ! Time step in dynamics
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real(dp) :: dx ! Atomic displacement used to calculate Hessian matrix
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real(dp) :: dxmax ! Max. atomic displacement allowed during geom. relaxation