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module grad2fill
! min r(m) = L J m + L known where L is a lowcut filter.
  use igrad2
  use cgstep_mod
  use mask1
  use solver_smp_mod
  implicit none
  contains
  subroutine grad2fill2( niter, m1, m2, mm, mfixed)
    integer, intent (in) :: niter, m1,m2
    logical, dimension (m1*m2), intent (in) :: mfixed
    ! mask for known
    real, dimension (m1*m2), intent (in out) :: mm
    ! model
    real, dimension (m1*m2*2) :: yy
    ! lowcut output
    logical, dimension (:), pointer :: msk
    allocate(msk(size(mfixed)))
    msk=.not.mfixed
    call mask1_init(msk)
    call igrad2_init(m1,m2)
    yy = 0. ! initialize
    call solver_smp(m=mm, d=yy, Fop=igrad2_lop, stepper=cgstep, niter=niter&
      &, m0=mm, Jop=mask1_lop)
    call cgstep_close ()
  end subroutine
end module