CLAS physics database search results Measurement E159M202 E1-6 V. Burkert 2001 theta(pi+) dsigma/d(−cos(theta_pip)) Data errors deg mcb/rad mcb/rad 9 5.09277 0.935815 27 4.89864 0.799806 45 3.50194 0.601623 63 3.79027 0.57909 81 3.65633 0.600954 99 3.80797 0.576519 117 3.65328 0.541529 135 4.01442 0.989247 153 1.92299 1.1883 171 2.00003 1.39309