CLAS physics database search results Measurement E159M309 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 3.09628 0.597441 27 3.02324 0.450119 45 2.68928 0.371023 63 1.96669 0.269905 81 1.54605 0.214045 99 1.45903 0.209249 117 1.58384 0.233639 135 1.60912 0.227693 153 1.56883 0.245839 171 1.44725 0.274815