UPWEI                                                      UPWEI Ver. 2000.03.30

       Procedure for weights update.

       Description of menu items.
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(H) -- Put on-line help on the screen, which you are reading just now.

(I) -- Start doing iterative calculation of reweight constants. Up to
       UPWEI_MAXIT iterations will be made unless convergence 
       criterion will be reached: ratio of chi_square to its 
       mathematical expectation will differ from unity by less than 
       UPWEI_CHITOL parameters for all baselines not including 
       a) baselines which has less than NEQU_MIN used observations; 
       b) baselines which has applied reweight constant equal to 
       floor.

(M) -- Set maximum number of iterations in the range [1, 32767].

(U) -- Update weights only once. Only one iteration of the calculation
       reweight correction will be made.

(T) -- Set tolerance factor in the range [0.0001, 1.0]. This quantity 
       is used during iterative weights update. Iterations will be 
       stopped when the ratio of chi_square to its mathematical 
       expectation will differ from unity by less than tolerance 
       factor for all baselines.

(N) -- Re-read reweight constants from NAMFIL. It will substitute the 
       constants currently applied to the weights.

(E) -- Enter initial weights. Initial corrections (the same for all 
       baselines) to weights may be entered. It will substitute the 
       correction currently applied to the weights. Initial weights
       should be in the range [0, 10**6] psec.

(L) -- Set floor of reweight constants in the range [0, 300] psec.
       UPWEI never sets reweight constant less than the specified 
       floor. If correction which provides the ratio of chi-square 
       to its mathematical expectation for the baseline under 
       consideration should have value less than floor, then UPWEI 
       sacrifices the criterion of chi-square and sets reweight 
       quantity to the floor value forcible. 

(V) -- Switch of verbose mode. If verbose mode is switched on then
       more verbose information is printed at the screen and in 
       the spool file during work of UPWEI.

(B) -- Baseline-dependent mode is switched on. The set 
       baseline-dependent constants will be determined for.

(G) -- Global mode is switched on. One baseline-independent constants 
       will be determined for.

(D) -- File statistics in working directory UPWEIxx will be created and
       its content will rewritten to the spool file and then displayed 
       at the screen. It contains number of used observations, w.r.m.s, 
       applied weights corrections and the ratio of chi-square to
       its mathematical expectation for all baselines, sources 
       separately and for all observations together.
    
(O) -- Return back to the calling program.
