CLAS physics database search results Measurement E159M580 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 1.20354 0.246039 27 1.6523 0.282616 45 1.7144 0.283543 63 1.70189 0.253286 81 1.71882 0.247928 99 1.77023 0.253689 117 1.81951 0.270577 135 1.50428 0.39062 153 1.15946 0.792188 171 1.22725 0.916751