CLAS physics database search results Measurement E159M83 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.73968 0.127974 90 0.606968 0.10191 150 0.685608 0.115021 210 0.637138 0.109795 270 0.676332 0.108763 330 0.866427 0.143847