CLAS physics database search results Measurement E159M768 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 1.10843 0.245522 27 1.48641 0.252217 45 1.57634 0.232854 63 1.57995 0.224388 81 1.57145 0.231279 99 1.89733 0.287855 117 1.5699 0.242467 135 1.85382 0.288964 153 1.74229 0.275043 171 1.66591 0.32324