CLAS physics database search results Measurement E159M22 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.80135 0.274885 27 0.985704 0.211894 45 1.37053 0.2329 63 1.46964 0.238691 81 1.76062 0.282459 99 1.63989 0.29206 117 1.02756 0.207782 135 0.718208 0.989247 153 0.589124 0.61011 171 0.584623 0.96079