ATOMFT ver. 3.11, copyright(C) 1979-93, Y. F. Chang. ----------------------------------------------------- COPTION DOUBLE,DUMP=1 DIFF ( Y1 , X , 1 ) = - Y2 DIFF ( Y2 , X , 1 ) = DIFF ( Y2 , X , 1 ) DIFF ( Y2 , X , 2 ) = DIFF ( Y2 , X , 2 ) DIFF ( Y2 , X , 3 ) = DIFF ( Y2 , X , 3 ) DIFF ( Y2 , X , 4 ) = DIFF ( Y2 , X , 4 ) DIFF ( Y2 , X , 5 ) = Y1 $ **ERR030** the variable on the LHS of the = in equation 3 defined before