constraint_eqn_015 Subroutine

   subroutine constraint_eqn_015(tmp_cc, tmp_con, tmp_err, tmp_symbol, tmp_units)
      !! Equation for L-H power threshold limit
      !! author: P B Lloyd, CCFE, Culham Science Centre
      !! args : output structure : residual error; constraint value;
      !! residual error in physical units; output string; units string
      !! Equation for L-H power threshold limit
      !! #=# physics
      !! #=#=# flhthresh, plhthresh
      !! and hence also optional here.
      !! Logic change during pre-factoring: err, symbol, units will be assigned only if present.
      !! flhthresh : input real : f-value for L-H power threshold
      !! plhthresh : input real : L-H mode power threshold (MW)
      !! pdivt : input real : power to conducted to the divertor region (MW)
      use constraint_variables, only: flhthresh
      use physics_variables, only: plhthresh, pdivt
      implicit none
            real(dp), intent(out) :: tmp_cc
      real(dp), intent(out) :: tmp_con
      real(dp), intent(out) :: tmp_err
      character(len=1), intent(out) :: tmp_symbol
      character(len=10), intent(out) :: tmp_units

      tmp_cc =  -(1.0D0 - flhthresh * plhthresh / pdivt)
      tmp_con = plhthresh
      tmp_err = plhthresh - pdivt / flhthresh
      if (flhthresh > 1.0D0) then
         tmp_symbol = '>'
      else
         tmp_symbol = '<'
      end if
      tmp_units = 'MW'

   end subroutine constraint_eqn_015