CLAS physics database search results Measurement E159M553 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Stat. error deg mcb/rad mcb/rad 9 2.23921 0.444195 27 2.32265 0.349106 45 2.49739 0.399683 63 2.29794 0.320687 81 2.43993 0.330654 99 2.37639 0.313169 117 2.2823 0.314878 135 2.51345 0.480876 153 1.88638 1.26969 171 1.70503 1.14209