Fi ure 1 400 a11u1 4uu GROUP NUMBERS 23A 23 23 23 4 230 23A 23 23 Q 23A 4 E 4 3 I V Y 23 23A 23 4 4 g A tu K f r Q i lk U r 3 4 t 4 8 7 V5 7 4 A f 4 xi 4 13 23A mc 43 Q 23c R 2 U 13 1 r SAM 43 43 24 43 3