CLAS physics database search results Measurement E159M58 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.86634 0.466589 27 2.2819 0.426043 45 1.82751 0.301947 63 2.41858 0.367812 81 2.73037 0.410966 99 2.32901 0.338179 117 2.39273 0.373013 135 1.11028 0.989247 153 0.776588 0.580442 171 0.870334 0.90361