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  parameter (ndatmax=500)
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  parameter (ndatmax=500)
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  ! Numerical epsilon (for float comparison)
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  ! Numerical epsilon (for float comparison)
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  real :: eps
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  real :: eps
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  parameter (eps=0.001)
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  parameter (eps=0.001)
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  real         mdv                              ! missing data value
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  parameter    (mdv=-999.)
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  ! Prefix for primary and secondary fields
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  ! Prefix for primary and secondary fields
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  character :: charp
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  character :: charp
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  character :: chars
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  character :: chars
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  parameter (charp='P')
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  parameter (charp='P')
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  integer :: nx,ny,nz     ! Grid dimensions
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  integer :: nx,ny,nz     ! Grid dimensions
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  real :: dx,dy           ! Horizontal grid resolution
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  real :: dx,dy           ! Horizontal grid resolution
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  integer :: hem          ! Flag for hemispheric domain
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  integer :: hem          ! Flag for hemispheric domain
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  integer :: per          ! Flag for periodic domain
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  integer :: per          ! Flag for periodic domain
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  real :: stagz           ! Vertical staggering
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  real :: stagz           ! Vertical staggering
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  real :: mdv             ! Missing data value
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  ! Auxiliary variables
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  ! Auxiliary variables
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  integer :: i,j,k,l,m,n
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  integer :: i,j,k,l,m,n
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  real :: rd
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  real :: rd
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  character(len=80) :: filename,varname
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  character(len=80) :: filename,varname
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  varsinp(4) = 'z'
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  varsinp(4) = 'z'
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  ! Transform start coordinates from index space to WRF grid
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  ! Transform start coordinates from index space to WRF grid
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  do i=1,ntra
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  do i=1,ntra
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     do j=1,ntim
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     do j=1,ntim
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         if ( ( abs(trainp(i,j,2)-mdv).gt.eps).and.( abs(trainp(i,j,3)-mdv).gt.eps) ) then
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         trainp(i,j,2) = xmin + ( trainp(i,j,2) - 1. ) * dx
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            trainp(i,j,2) = xmin + ( trainp(i,j,2) - 1. ) * dx
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         trainp(i,j,3) = ymin + ( trainp(i,j,3) - 1. ) * dy
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            trainp(i,j,3) = ymin + ( trainp(i,j,3) - 1. ) * dy
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         endif
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     enddo
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     enddo
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  enddo
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  enddo
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  ! Write some status information of the input trajectories
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  ! Write some status information of the input trajectories
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  print*,'---- INPUT TRAJECTORIES ---------------------------------'
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  print*,'---- INPUT TRAJECTORIES ---------------------------------'
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  enddo
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  enddo
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 ! Transform coordinates into index space
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 ! Transform coordinates into index space
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   do i=1,ntra
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   do i=1,ntra
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     do j=1,ntim
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     do j=1,ntim
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         if ( ( abs(traout(i,j,2)-mdv).gt.eps ).and.( abs(traout(i,j,3)-mdv).gt.eps ) ) then
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         traout(i,j,2) = ( traout(i,j,2) - xmin ) / dx + 1.
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            traout(i,j,2) = ( traout(i,j,2) - xmin ) / dx + 1.
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         traout(i,j,3) = ( traout(i,j,3) - ymin ) / dy + 1.
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            traout(i,j,3) = ( traout(i,j,3) - ymin ) / dy + 1.
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         endif
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     enddo
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     enddo
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  enddo
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  enddo
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  ! Write trajectories
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  ! Write trajectories
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  call wopen_tra(fod,outfile,ntra,ntim,ncol+ntrace0, &
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  call wopen_tra(fod,outfile,ntra,ntim,ncol+ntrace0, &