CLAS physics database search results Measurement E159M138 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 2.11168 0.433214 27 3.75994 0.603643 45 3.77864 0.582297 63 4.16762 0.63146 81 3.90847 0.592266 99 3.52922 0.540251 117 3.03193 0.468016 135 3.21116 0.507333 153 3.15988 0.507458 171 3.09181 0.573491