G02GBF Example Program Data
'G' 'M' 'N' 'U' 3 1    :: LINK,MEAN,OFFSET,WEIGHT,N,M
 1.0 19. 516.
 0.0 29. 560.
-1.0 24. 293.          :: End of X,Y,T
  1                    :: ISX
0  1.0E-6  5.0E-5  10  :: IPRINT,EPS,TOL,MAXIT