CLAS physics database search results Measurement E159M471 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 1.19493 0.307953 27 1.16737 0.20993 45 1.20763 0.202737 63 1.02819 0.202884 81 0.950316 0.161841 99 1.10024 0.199852 117 0.859521 0.155162 135 0.877859 0.139758 153 1.17584 0.264208 171 1.16957 0.426055