CLAS physics database search results Measurement E159M1012 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.502272 0.228895 27 0.581716 0.130372 45 0.721523 0.172229 63 0.921135 0.172531 81 0.954636 0.17229 99 0.91422 0.186851 117 0.924879 0.180072 135 0.627756 0.181178 153 0.441843 0.295672 171 0.622862 0.496714