CLAS physics database search results Measurement E159M875 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.04091 0.0114682 90 0.0396176 0.0125918 150 0.034677 0.0091947 210 0.0480437 0.0189853 270 0.0427835 0.012412 330 0.0531699 0.0151791