CLAS physics database search results Measurement E159M157 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 2.81175 0.539833 27 3.97119 0.659328 45 2.8975 0.521156 63 3.7777 0.589794 81 3.7186 0.535533 99 4.04054 0.594696 117 3.75387 0.548486 135 3.57021 0.989247 153 2.00061 1.21742 171 1.64692 1.20093