CLAS physics database search results Measurement E159M319 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 2.24983 0.383014 27 2.74056 0.38722 45 2.51219 0.365075 63 2.32339 0.312223 81 2.65435 0.343759 99 2.9354 0.391227 117 2.84353 0.379612 135 2.68176 0.533056 153 1.86919 1.12767 171 2.19918 1.3376