CLAS physics database search results Measurement E159M218 E1-6 V. Burkert 2001 psi(p) dsigma/dpsi_pr Data errors deg mcb/rad mcb/rad 30 0.918396 0.145137 90 0.979792 0.162204 150 1.11713 0.176466 210 1.18541 0.188816 270 1.03461 0.167845 330 0.982222 0.165855