program e_curve
  use bitmasks
  implicit none
  integer :: i,j,k, kk, nab, m, l
  double precision :: norm, E, hij, num, ci, cj
  double precision :: e_0(N_states)
  PROVIDE mo_two_e_integrals_in_map mo_one_e_integrals

  if (.not.read_wf) then
    stop 'Please set read_wf to true'
  endif

  PROVIDE psi_bilinear_matrix nuclear_repulsion
  PROVIDE psi_coef_sorted psi_det psi_coef
  print *,  ''
  print *,  '=============================='
  print *,  'Energies at different cut-offs'
  print *,  '=============================='
  print *,  ''
  print *,  '=========================================================='
  print '(A8,2X,A8,2X,A12,2X,A10,2X,A12)',  'Thresh.', 'Ndet', 'Cost', 'Norm', 'E'
  print *,  '=========================================================='
  double precision :: thresh
  integer(bit_kind), allocatable :: det_i(:,:), det_j(:,:)
  thresh = 1.d-10

  nab = n_det_alpha_unique+n_det_beta_unique


  do while (thresh  < 1.d0)
    norm = 0.d0
    do k=1,n_det
      if (dabs(psi_coef(k,1)) < thresh) then
        psi_coef(k,1) = 0.d0
      endif
      norm = norm + psi_coef(k,1)**2
    enddo
    TOUCH psi_coef
    norm = norm/dsqrt(norm)

    psi_coef(1:N_det,1) = psi_coef_sorted(1:N_det,1)
    psi_det(1:N_int,1:2,1:N_det) = psi_det_sorted(1:N_int,1:2,1:N_det)
    do k=1,n_det
      if (psi_coef(k,1) == 0.d0) then
        exit
      endif
    enddo
    n_det = k-1
    TOUCH n_det psi_coef psi_det

    j = n_det_alpha_unique+n_det_beta_unique
    call u_0_H_u_0(E,psi_coef,n_det,psi_det,N_int,1,size(psi_coef,1))

    print '(E9.1,2X,I8,2X,F10.2,2X,F10.8,2X,F15.10)',  thresh, n_det, &
      dble( elec_alpha_num**3 + elec_alpha_num**2 * (nab-1) ) / &
      dble( elec_alpha_num**3 + elec_alpha_num**2 * (nab-j)), norm, &
       psi_energy(1)
    thresh = thresh * dsqrt(10.d0)
  enddo
  print *,  '=========================================================='

end