anchor.diff:    ! Create a temporary memory-mapped file
     integer                        :: fd
     type(c_ptr)                    :: c_pointer
  -  integer*8, pointer             :: a_array(:,:,:)
  +  integer*8, pointer             :: a_array(:,:)
     call mmap(trim(ezfio_filename)//'/work/four_idx',                  &
  -      (/ 2_8,int(i_end-i_start+1,8),int(j_end-j_start+1,8),int(k_end-k_start+1,8), int(l_end-l_start+1,8) /), 8, fd, .False., c_pointer)
  -  call c_f_pointer(c_pointer, a_array, (/ 4, (i_end-i_start+1)*(j_end-j_start+1)*(k_end-k_start+1)/2, l_end-l_start+1 /))
  -
  +      (/ (int(i_end-i_start+1,8)*int(j_end-j_start+2,8)*int(k_end-k_start+1,8)),int(l_end-l_start+1,8) /), 16, fd, .False., c_pointer)
  +  call c_f_pointer(c_pointer, a_array, (/ ((i_end-i_start+1)*(j_end-j_start+1)*(k_end-k_start+1)*3_8)/2_8, l_end-l_start+1_8 /))
   
     !$OMP PARALLEL DEFAULT(NONE) SHARED(a_array,c_pointer,fd,          &
         !$OMP  a_start,a_end,b_start,b_end,c_start,c_end,d_start,d_end,&
         !$OMP  i_start,i_end,j_start,j_end,k_start,k_end,l_start,l_end,&
         !$OMP  i_min,i_max,j_min,j_max,k_min,k_max,l_min,l_max,        &
         !$OMP  map_a,map_c,matrix_B)                                   &
  -      !$OMP  PRIVATE(key,value,T,U,V,i,j,k,l,idx,ik,   &
  +      !$OMP  PRIVATE(key,value,T,U,V,i,j,k,l,idx,ik,ll,   &
         !$OMP  a,b,c,d,tmp,T2d,V2d)
     allocate( key(i_max*j_max*k_max), value(i_max*j_max*k_max) )
     allocate( U(a_start:a_end, c_start:c_end, b_start:b_end) )
  
positive.code:   !$OMP DO SCHEDULE(dynamic,4)
    do l=l_start,l_end
      a = 1
      do j=j_start,j_end
        do k=k_start,k_end
          do i=i_start,k
            call bielec_integrals_index(i,j,k,l,idx)
            call map_get(map_a,idx,tmp)
            if (tmp /= 0.d0) then
              a = a+1
              a_array(1,a,l-l_start+1) = i
              a_array(2,a,l-l_start+1) = j
              a_array(3,a,l-l_start+1) = k
              a_array(4,a,l-l_start+1) = transfer(dble(tmp), 1_8)
            endif
          enddo
        enddo
      enddo
      a_array(1,1,l-l_start+1) = a
      print *,  l
    enddo
    !$OMP END DO
  
    allocate( T2d((i_end-i_start+1)*(k_end-k_start+2)/2, j_start:j_end), &
              V2d((i_end-i_start+1)*(k_end-k_start+2)/2, b_start:b_end), &
              V(i_start:i_end, k_start:k_end), &
              T(k_start:k_end, a_start:a_end) )
  
  
    !$OMP DO SCHEDULE(dynamic)
  
negative.code:       if (dabs(matrix_B(l,d)) < 1.d-10) then
          cycle
        endif
        
        ll = l-l_start+1
  !      T2d = 0.d0
  !      do a=2,a_array(1,ll),3
  !        ik = a_array(a,ll)
  !        j = a_array(a+1,ll)
  !        T2d(ik,j) = transfer(a_array(a+2,ll), 1.d0)
  !      enddo
  
        a=2
        do j=j_start,j_end
          ik=0
          do k=k_start,k_end
            do i=i_start,k
              ik = ik+1
              if ( (ik /= a_array(a,ll)).or.(j /= a_array(a+1,ll)) ) then
                T2d(ik,j) = 0.d0
              else
                T2d(ik,j) = transfer(a_array(a+2,ll), 1.d0)
                a=a+3
              endif
            enddo
          enddo
        enddo
        call DGEMM('N','N', ishft( (i_end-i_start+1)*(i_end-i_start+2), -1),&
            (d-b_start+1),                                             &
            (j_end-j_start+1), 1.d0,                                   &
            T2d(1,j_start), size(T2d,1),                               &
            matrix_B(j_start,b_start), size(matrix_B,1),0.d0,          &
            V2d(1,b_start), size(V2d,1) )
  
        do b=b_start,d
          ik = 0
          do k=k_start,k_end
            do i=i_start,k
  