CLAS physics database search results Measurement E159M57 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 1.79418 0.399845 27 2.54676 0.43427 45 2.62477 0.420577 63 2.32966 0.370446 81 1.98579 0.319972 99 1.79426 0.293885 117 1.75984 0.286305 135 1.58411 0.265281 153 1.60152 0.288212 171 1.27021 0.302633