constraint_eqn_061 Subroutine

   subroutine constraint_eqn_061(tmp_cc, tmp_con, tmp_err, tmp_symbol, tmp_units)
      !! Equation for availability 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 availability limit
      !! #=# cost
      !! #=#=# favail, avail_min
      !! and hence also optional here.
      !! Logic change during pre-factoring: err, symbol, units will be assigned only if present.
      !! favail : input real : F-value for minimum availability
      !! cfactr : input real : Total plant availability fraction
      !! avail_min : input real : Minimum availability
      use cost_variables, only: favail, cfactr, avail_min
      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 - favail * cfactr / avail_min
      tmp_con = avail_min * (1.0D0 - tmp_cc)
      tmp_err = cfactr * tmp_cc
      tmp_symbol = '>'
      tmp_units = ''

   end subroutine constraint_eqn_061