CLAS physics database search results Measurement E159M516 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 2.08546 0.455082 27 2.12493 0.368197 45 1.88829 0.28812 63 0.959482 0.146203 81 1.09088 0.194635 99 1.01845 0.190917 117 0.942017 0.153715 135 1.02441 0.181922 153 1.04056 0.227101 171 0.949172 0.277265