CLAS physics database search results Measurement E159M30 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 1.4349 0.368633 27 1.54542 0.287157 45 1.69006 0.29467 63 1.54305 0.253982 81 1.30889 0.22984 99 1.45652 0.243465 117 1.47942 0.260197 135 1.72151 0.295726 153 1.34065 0.258236 171 1.56631 0.388722