b* a1=a,/2(110) a2=a,/2(101) a3=a/2(011) a*=1/a(11-1) b*=1/a,(1-11) c*=1/a,(-111) 2/ao 日米 extinctiona 1 y z x a 3 a 2 a * c * b * a 1 = a 0 /2(110) a 2 = a 0 /2(101) a 3 = a 0 /2(011) a*= 1/a0 (11 -1) b*= 1/a0 (1 -11) c*= 1/a0 ( -111) 2/ a 0 extinction