CLAS physics database search results Measurement E159M679 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Stat. error deg mcb/rad mcb/rad 9 0.262483 0.11099 27 0.440382 0.0819045 45 0.552336 0.09283 63 0.591718 0.101184 81 0.430904 0.0631798 99 0.419549 0.06279 117 0.423636 0.066073 135 0.513625 0.188567 153 0.450856 0.304918 171 0.412439 0.402638