CLAS physics database search results Measurement E159M76 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.66154 0.423695 27 2.38636 0.422874 45 1.9588 0.341283 63 2.32983 0.351564 81 2.63925 0.385246 99 2.56832 0.387083 117 2.17446 0.339629 135 1.24948 0.989247 153 0.906244 0.633523 171 0.915806 0.880559