CLAS physics database search results Measurement E159M624 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 1.21539 0.266171 27 1.46792 0.24515 45 1.5659 0.256453 63 2.03593 0.327966 81 1.63822 0.244371 99 1.76698 0.27932 117 1.52481 0.246312 135 1.35637 0.231778 153 1.74037 0.307165 171 1.2799 0.281112