CLAS physics database search results Measurement E159M291 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 2.69185 0.445988 27 2.66803 0.41119 45 2.2503 0.303702 63 1.80407 0.2474 81 1.25536 0.1804 99 1.32926 0.195079 117 1.1175 0.155771 135 1.20281 0.170221 153 1.29974 0.225347 171 1.07044 0.21521