CLAS physics database search results Measurement E159M283 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.46882 0.331984 27 1.76705 0.263622 45 1.62294 0.254865 63 1.77479 0.256346 81 1.66025 0.218824 99 1.90207 0.251754 117 2.11772 0.308687 135 1.70273 0.338833 153 1.12275 0.641259 171 1.19743 0.803239