CLAS physics database search results Measurement E159M544 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Stat. error deg mcb/rad mcb/rad 9 1.57519 0.328513 27 2.56985 0.479775 45 1.88846 0.278372 63 1.9726 0.284866 81 1.98287 0.269587 99 2.11125 0.286182 117 2.06487 0.279569 135 1.80071 0.418442 153 1.96442 0.844195 171 1.40802 0.980476