CLAS physics database search results Measurement E159M687 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 0.529753 0.139531 27 0.733702 0.139535 45 0.61832 0.0975792 63 0.598093 0.098877 81 0.429692 0.0713788 99 0.519096 0.0920408 117 0.557808 0.097527 135 0.674323 0.141398 153 0.431644 0.0884237 171 0.322611 0.110918