CLAS physics database search results Measurement E159M967 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.484337 0.178504 27 0.552956 0.146355 45 0.641628 0.129312 63 0.629517 0.129725 81 0.75081 0.150724 99 0.603095 0.111023 117 0.659652 0.126914 135 0.680441 0.153136 153 0.385174 0.274471 171 0.490393 0.411522