CLAS physics database search results Measurement E159M850 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.01255 0.21943 27 1.01987 0.193243 45 0.90906 0.199432 63 1.24055 0.203729 81 1.02441 0.169764 99 1.06289 0.171158 117 1.25597 0.209318 135 1.15121 0.332203 153 0.851537 0.64327 171 0.941209 0.767442