CLAS physics database search results Measurement E159M913 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Stat. error deg mcb/rad mcb/rad 9 0.353992 0.160987 27 0.433019 0.173878 45 0.458395 0.107674 63 0.525812 0.122959 81 0.630475 0.122789 99 0.482221 0.0995933 117 0.502415 0.104663 135 0.574151 0.124107 153 0.35415 0.248441 171 0.307936 0.32327