CLAS physics database search results Measurement E159M193 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 4.13732 0.753287 27 4.26044 0.691951 45 3.57038 0.609157 63 3.51888 0.555533 81 3.59566 0.556096 99 3.99347 0.592509 117 3.8478 0.575984 135 3.82761 0.989247 153 1.92794 1.18667 171 1.84212 1.30393