CLAS physics database search results Measurement E159M535 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.50959 0.304041 27 1.82 0.294719 45 1.77518 0.294549 63 2.03263 0.307294 81 1.71013 0.239115 99 1.49646 0.216314 117 1.67328 0.240976 135 1.45755 0.354538 153 1.05836 0.735153 171 1.09393 0.815736