CLAS physics database search results Measurement E159M391 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 2.71116 0.466005 27 3.40997 0.547862 45 2.68629 0.406276 63 2.61136 0.368062 81 2.66705 0.372428 99 2.90602 0.401309 117 2.87315 0.417348 135 2.36945 0.533565 153 1.91741 1.25592 171 2.07418 1.35244