CLAS physics database search results Measurement E159M31 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.766499 0.285069 27 1.20235 0.23258 45 1.78366 0.282507 63 1.913 0.306825 81 2.01888 0.295007 99 1.96901 0.311806 117 1.67949 0.286237 135 0.898737 0.989247 153 0.711557 0.629771 171 0.765374 1.00367