CLAS physics database search results Measurement E159M561 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 2.30324 0.579095 27 2.43283 0.423483 45 2.08531 0.307732 63 2.16774 0.316738 81 2.15757 0.314705 99 2.56667 0.420027 117 2.31482 0.381012 135 2.77724 0.449333 153 3.32951 0.508064 171 2.26569 0.465796