CLAS physics database search results Measurement E159M822 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 0.976856 0.260315 27 0.991828 0.172877 45 1.32023 0.213 63 1.57219 0.250021 81 1.2948 0.205405 99 1.18153 0.18825 117 1.10591 0.189358 135 1.11071 0.20173 153 1.0337 0.217742 171 0.621184 0.1757