CLAS physics database search results Measurement E159M570 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Stat. error deg mcb/rad mcb/rad 9 0.760596 0.192502 27 1.68918 0.304428 45 2.10786 0.332461 63 1.95268 0.281087 81 1.79625 0.258032 99 1.94321 0.289068 117 1.84763 0.292815 135 1.65736 0.258102 153 1.46966 0.265907 171 1.42062 0.274369