(1) On p. 041402-3, 1k in Eq. (2a) should read  
1k=max{0.001k2+0.031k1+k0,k2(Y2c¯)4+k1(Y2c¯)2+k0}.

(2) On p. 041402-8, 2θs*=α1+α2 in Fig. 10 should read θs*=α1+α2.