CLAS physics database search results Measurement E159M400 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 3.24804 0.553661 27 3.16551 0.481682 45 3.02511 0.487559 63 2.75638 0.388208 81 2.5336 0.352463 99 2.90671 0.424688 117 2.95166 0.420815 135 2.53201 0.528244 153 1.68731 1.08144 171 2.04241 1.33906