CLAS physics database search results Measurement E159M39 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 1.63863 0.386013 27 1.73755 0.309497 45 2.08034 0.341208 63 1.84639 0.29759 81 1.72067 0.279946 99 1.59513 0.265867 117 1.77637 0.293836 135 1.95256 0.321862 153 1.41915 0.252333 171 1.04884 0.272567