CLAS physics database search results Measurement E159M130 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 3.4839 0.812191 27 4.74465 0.751397 45 4.42268 0.688533 63 4.54723 0.643196 81 4.66878 0.641205 99 4.97398 0.683939 117 4.58406 0.635646 135 3.31971 0.989247 153 1.76765 1.03422 171 1.65825 1.18656