CLAS physics database search results Measurement E159M994 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.537899 0.15127 27 1.1751 0.286623 45 0.958347 0.195241 63 1.03381 0.17396 81 1.10866 0.201321 99 0.952121 0.157942 117 0.978103 0.181312 135 0.75961 0.207818 153 0.62312 0.369311 171 0.787359 0.573709