CLAS physics database search results Measurement E159M67 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.51599 0.39872 27 1.93772 0.344762 45 2.05119 0.355774 63 2.05515 0.319547 81 2.77323 0.407471 99 2.68056 0.464615 117 2.6822 0.434775 135 1.07314 0.989247 153 0.83712 0.602319 171 0.829664 0.84996