CLAS physics database search results Measurement E159M498 E1-6 V. Burkert 2001 theta(pi-) dsigma/d(−cos(theta_pim)) Data errors deg mcb/rad mcb/rad 9 1.79119 0.450884 27 1.56514 0.279648 45 1.60144 0.242484 63 1.06821 0.175363 81 0.987834 0.163328 99 1.04259 0.174194 117 0.6657 0.119816 135 0.953363 0.251133 153 0.787039 0.141317 171 0.59357 0.141312