CLAS physics database search results Measurement E159M209 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 1.09573 0.177752 90 1.06025 0.166684 150 1.16587 0.187645 210 1.0566 0.16987 270 1.07405 0.172696 330 1.13249 0.182838