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step1
   ISTART = 0
   ICHARG = 2

   IBRION = -1
    NSW = 0

     GGA = PE
     ENCUT = 600

   PREC   = Accurate
   NELM   = 100
   NELMIN = 2
   EDIFF  = 1.0e-5
   ISMEAR =  0
   SIGMA  = 0.05
   LWAVE = .TRUE.
  LCHARG = .TRUE.
   ALGO  = NORMAL

   LREAL = .False.

step2
ISTART = 1


   IBRION = -1
    NSW = 0

     GGA = PE
     ENCUT = 600

   PREC   = Accurate
   NELM   = 100
   NELMIN = 2
   EDIFF  = 1.0e-5
   ISMEAR =  0
   SIGMA  = 0.05
   LWAVE = .TRUE.
  LCHARG = .TRUE.

   ALGO  = Exact
   NBANDS = 64
   LOPTICS = .TRUE.
   NEDOS = 2000

   LREAL = .False.


step3

   ISTART = 1
   IBRION = -1
    NSW = 0

     GGA = PE
     ENCUT = 600

   PREC   = Accurate
   NELM   = 100
   NELMIN = 2
   EDIFF  = 1.0e-5
   ISMEAR =  0
   SIGMA  = 0.05
   LWAVE = .TRUE.
  LCHARG = .TRUE.

   ALGO = GW0
   LSPECTRAL = .TRUE.
   NOMEGA = 50
   NBANDS = 64
   LRPA = .FALSE.
   LWANNIER90 = .TRUE.

#   ALGO  = Exact
#   NBANDS = 64
#   LOPTICS = .TRUE.
#   NEDOS = 2000

   LREAL = .False.

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