CLAS physics database search results Measurement E159M678 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 0.352635 0.109799 27 0.484883 0.0889631 45 0.493937 0.095452 63 0.485837 0.0868851 81 0.29089 0.0526957 99 0.41581 0.0789996 117 0.442291 0.0843227 135 0.387001 0.0763171 153 0.395913 0.0884992 171 0.500454 0.131001