CLAS physics database search results Measurement E159M706 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 0.294072 0.102538 27 0.600591 0.112094 45 0.732969 0.149083 63 0.679364 0.11505 81 0.700751 0.101178 99 0.73304 0.106571 117 0.861542 0.129417 135 0.748693 0.209817 153 0.559341 0.365393 171 0.520491 0.458489