CLAS physics database search results Measurement E216M931 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.0414188 0.0101195 0.01239808 54 0.0537699 0.00814517 0.00969607 90 0.056844 0.0077669 0.0063287 126 0.0677334 0.00836698 0.00797138 162 0.0794556 0.00913764 0.00806526 198 0.0860887 0.00822948 0.00706495 234 0.0616545 0.00645821 0.00625761 270 0.0638056 0.00659966 0.00678535 306 0.0506015 0.00791888 0.00542234 342 0.0388184 0.00492655 0.00780156