CLAS physics database search results Measurement E159M1030 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.471653 0.208327 27 0.781916 0.222993 45 0.725093 0.163923 63 0.857503 0.178295 81 0.679212 0.120802 99 0.780564 0.155967 117 0.883162 0.182561 135 0.706766 0.181942 153 0.526425 0.394765 171 0.604684 0.497645