CLAS physics database search results Measurement E159M183 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 3.67357 0.682 27 3.89609 0.60853 45 3.90629 0.609355 63 3.95022 0.599119 81 3.4477 0.521877 99 3.1533 0.475979 117 2.93089 0.451222 135 3.13673 0.489404 153 3.2591 0.524697 171 2.97518 0.550693