! linear scaling SCF
    &LS_SCF
      ! SIGN_MATRIX, only effective if the chemical potential is known in advance 
      PURIFICATION_METHOD SIGN_MATRIX
      ! threshold used to determine sparsity and thus speed and accuracy
      EPS_FILTER 1E-7
      ! convergence for the SCF
      EPS_SCF    1E-5
      ! chemical potential, an energy from within in the HOMO-LUMO gap
      MU         -0.15
      S_PRECONDITIONER ATOMIC
    &END