subroutine FIT_SET(k,uk,wk,a,b)
c       -------------------------------

	include 'fit.inc'

	integer k
	real uk, wk, a, b

	if (k .eq. 0) goto 90

	if (k.gt.nu .or. k.le.0) then
	  write(isyswr,'(4x,a,i3)') 'Illegal parameter no.:',k
	  return
	endif

	if (icsw(k) .gt. 0) then
	  icsw(k)=0
	elseif (icsw(k) .lt. 0) then
	  write(isyswr, '(x,4a)') pnam(k), ' not changed (depends on ',
	1                         pnam(icto(k)),')'
	  return
	endif

	u(k)=uk
	if (wk .gt. 0) werr(k)=wk	  
	if (wk .eq. 0 .or. ififu .eq. 6 .and. k .gt. 2) then
	  lcode(k)=-1
	  if (werr(k) .ne. 0) werrs(k)=werr(k)
	  werr(k)=0
	endif

	if (a .ne. 0 .or. b .ne. -1.0) then
	  call fit_lim(k, a, b)
	  return
	endif

90	call extoin
	call fit_check_range
        call fnctn(x,amin)	
	end



	subroutine FIT_LIM(k, a, b)
c	---------------------------

	include 'fit.inc'

	integer k
	real a, b

	if (k.gt.nu .or. k.le.0) then
	  write(isyswr,'(4x,a,i3)') 'Illegal parameter no.:',k
	  return
	endif
	
	if (a .lt. b) then
	  lcode(k)=sign(4, lcode(k))
	  alim(k)=a
	  blim(k)=b
	  if (u(k)-werr(k) .lt. a) then
	    alim(k)=u(k)-werr(k)
	    write(isyswr,'(x,2A,f14.5)')
	1     pnam(k), ': Lower limit changed to ',alim(k)
	  endif
	  if (u(k)+werr(k) .gt. b) then
	    blim(k)=u(k)+werr(k)
	    write(isyswr,'(x,2A,f14.5)')
	1     pnam(k), ': Upper limit changed to ',blim(k)
	  endif
	elseif (a .eq. 0 .and. b .eq. 0) then
	  lcode(k)=sign(1, lcode(k))
	else
	  write(isyswr,'(x,a,2e10.2)')
	1   'low limit must be lower than high limit',a,b
	endif

	call extoin
	call fit_check_range
        call fnctn(x,amin)
  	end