CLAS physics database search results Measurement E159M436 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 3.5181 0.568092 27 2.93466 0.451748 45 2.62027 0.406374 63 2.17556 0.332017 81 2.05999 0.314977 99 2.04974 0.292423 117 2.00482 0.294031 135 1.95705 0.464949 153 1.58223 1.00795 171 1.73176 1.16965