CLAS physics database search results Measurement E159M615 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 1.11869 0.247527 27 1.63739 0.274255 45 1.48696 0.231121 63 1.90946 0.288486 81 1.84716 0.272169 99 1.5804 0.240275 117 1.39143 0.226147 135 1.51401 0.25829 153 1.52874 0.28294 171 1.06623 0.233984