CLAS physics database search results Measurement E159M129 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 2.63025 0.52255 27 4.23586 0.680596 45 4.27394 0.649202 63 4.41266 0.664519 81 4.13249 0.618958 99 3.77155 0.576511 117 3.33952 0.516253 135 3.47697 0.537192 153 3.92401 0.618791 171 3.49416 0.625767