CLAS physics database search results Measurement E159M489 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 1.17371 0.272528 27 1.85565 0.302293 45 1.54808 0.264965 63 1.23562 0.207026 81 0.923823 0.176602 99 0.801979 0.124413 117 0.883848 0.215307 135 0.803709 0.124756 153 0.838763 0.144621 171 0.784105 0.188595