C RC3       FIRST-ORDER MATRICES USED IN FITTING
C
C RC3   CUMULATIVE R MATRIX BETWEEN VARIED ELEMENTS, CONSTRAINTS, 
C       OR R2 UPDATES
C
	REAL            RC3(6,6), RC3L(36), RSH(6,6), RSHL(36)
	EQUIVALENCE     (RC3(1,1),RC3L(1),RSH(1,1),RSHL(1))
C
	COMMON /RC3/    RC3