C+
C NAME:
C	FixModeltdn
C PURPOSE:
C	To determine the change needed for the various lines of sight (LOS)
C	[g = m/<m> ==> dm = <m> dg]
C	The velocity and density (Thomson scattering) analyses are handled the same but differently 
C	than g-levels according to the mode input.
C CATEGORY:
C	Data processing
C CALLING SEQUENCE:
C	call FixModeltdn(ID,NL,OBSV,MODV,PW,NBS,SIG,FIX,SSIG,RAT)
C INPUTS:
C	ID		integer	1: Fix V model
C				2: Fix G model (Only this mode does anything different. For ipshtd this mode is not used.
C				3: Fix Thomson scattering model
C	NL		integer	# data points
C	OBSV(NL)	real	Observed values
C	MODV(NL)	real	Model values
C	SIG		real	previous convergence criteria
C	PW		real    Power of G
C	NBS(NL)		integer Bad source
C OUTPUTS:
C	SIG		real	new convergence criteria
C	FIX(NL)		real	Ratio of observed to model values	????
C	SSIG(NL)	real	deviation from mean			????
C	RAT		real	Ratio by which to multiply DEN1AU (G only)
C FUNCTIONS/SUBROUTINES:
C PROCEDURE:
C MODIFICATION HISTORY:
C	NOV, 1995 B. Jackson (STEL,UCSD)
C-
	subroutine FixModeltdn(ID,NL,OBSV,MODV,PW,NBS,SIG,FIXR,SSIG,RAT)
	real		OBSV(NL),	! Observed G-levels
     &			MODV(NL),	! Modeled G-levels
     &			FIXR(NL),	! Ratio of observed to modeled G-values
     &			SSIG(NL)	! G-source deviation from mean
	integer		NBS(NL)		! Bad source value
	character	cStr*100,
     &			cID(3)		/'V','G','D'/
	SIGOLD = SIG			! Only used in Say statement
	SIG = 0 .
	RAT = 0.			! Only useful for ID=1 (G level)
	NLL = 0 .
	PWD = 2.0
	do I=1,NL
	    OBS = OBSV(I)
	    if (ID .eq. 2) OBS = OBSV(I)*OBSV(I) 	! OK for g-value linearization 7/14/00 B. Jackson
	    R = OBS/MODV(I)
	    FIXR(I) = 1.0
	    if(NBS(I).ne.0) then
		FIXR(I) = R				! In 6/10/00 B. Jackson
C	    	FIXR(I) = R**PW				! Out 6/10/00 B. Jackson
C		if(ID.eq.3) FIXR(I) = R**PWD 		! Original for Helios data, removed 3/26/01
		if (FIXR(I).gt.10.0) FIXR(I) = 10.0
		if (FIXR(I).lt.0.1)  FIXR(I) = 0.1
 
		NLL = NLL + 1
C		RAT = RAT +  SQRT(1/R)	! Out 7/9/00 B. Jackson
		RAT = RAT + (1./R)	! In 7/9/00 B. Jackson
		R = R-1
		SSIG(I) = R
C	print *, ' I, SIG, R, RAT, SSIG(I)', I, SIG, R, RAT, SSIG(I)
		SIG = SIG + R*R
	    end if
	end do
	if(ID.eq.1) RAT =  RAT/NLL
	if(ID.eq.2) RAT = (RAT/NLL)**(1./PW)	! In 7/14/00 B. Jackson
	if(ID.eq.3) RAT =  RAT/NLL
C	if(ID.eq.2) RAT = (RAT/NLL)**2.0	! Out 7/14/00 B. Jackson
C	print *, 'SIG, NLL, NL', SIG, NLL, NL
	SIG = sqrt(SIG/NLL)
	do I=1,NL
	    if(NBS(I).ne.0) SSIG(I) = SSIG(I)/SIG
	end do
	write (cStr,'(A,F6.3,A,F7.3,A)') cID(ID)//' convergence = ',SIG,
     &		', from last =',abs(1-SIG/SIGOLD)*100,'%'
	if (ID .eq. 1) write (cStr(itrim(cStr)+1:),'(A,F7.3)') '#Summed model to observed velocity ratio ',RAT
	if (ID .ge. 2) write (cStr(itrim(cStr)+1:),'(A,F7.3)') '#Summed model to observed density ratio ',RAT
	call Say('FixModeltdn','I','Info',cStr)
	return
	end