SYSTEM = NaCl

ALGO   = Exact
ISMEAR = 0    
SIGMA  = 0.01
EDIFF  = 1.E-6

LASPH  = T 

! electronic dielectric function with Kramers-Kronig
LOPTICS  = T    ! frequency-dependent dielectric matrix
CSHIFT   = 0.1  ! complex shift (default) 
NBANDS   = 32   ! sum over unoccupied bands
NEDOS    = 2000 ! frequency grid