CLAS physics database search results Measurement E159M616 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.55538 0.308498 27 1.65777 0.293335 45 1.59669 0.275393 63 1.79881 0.276637 81 1.48727 0.229559 99 1.9231 0.291324 117 1.6977 0.249426 135 1.71764 0.412643 153 1.15066 0.776019 171 1.30215 0.978049