CLAS physics database search results Measurement E159M633 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 1.46298 0.336854 27 1.56858 0.258056 45 1.83833 0.30936 63 1.60619 0.257034 81 1.70075 0.268617 99 1.4905 0.247969 117 1.50092 0.242558 135 1.22318 0.220376 153 1.82322 0.358101 171 1.04608 0.264254