CLAS physics database search results Measurement E159M310 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.63166 0.297712 27 1.67257 0.253944 45 1.74226 0.255889 63 2.01533 0.276882 81 2.16189 0.29462 99 2.14763 0.297343 117 2.06489 0.282065 135 1.77638 0.400852 153 1.31788 0.798813 171 1.52952 0.980675