CLAS physics database search results Measurement E159M976 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.387602 0.184399 27 0.786533 0.184192 45 0.864068 0.194333 63 0.809796 0.152705 81 0.991392 0.176965 99 0.874272 0.158592 117 0.993124 0.202876 135 0.896924 0.181242 153 0.808994 0.706864 171 0.650346 0.494086