CLAS physics database search results Measurement E159M939 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 0.39272 0.132347 27 0.4178 0.0896186 45 0.361569 0.069432 63 0.313973 0.0597025 81 0.417261 0.0993367 99 0.399494 0.101504 117 0.315552 0.0751082 135 0.33428 0.087333 153 0.3368 0.0950081 171 0.0991872 0.0607062