CLAS physics database search results Measurement E159M49 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.64858 0.423146 27 2.37049 0.416218 45 2.17249 0.345839 63 2.4947 0.391071 81 2.79592 0.39533 99 2.63152 0.381188 117 2.10631 0.331349 135 1.22325 0.989247 153 0.760617 0.596778 171 0.884512 0.95784