CLAS physics database search results Measurement E216M202 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.658259 0.0183005 0.0980998 54 0.648107 0.0191771 0.07282294 90 0.654105 0.0151005 0.05701469 126 0.703809 0.0240349 0.05725799 162 0.717885 0.0169655 0.05927794 198 0.707228 0.0135 0.05700519 234 0.682118 0.0134454 0.05546276 270 0.684274 0.0165608 0.05842275 306 0.661758 0.0179457 0.07119353 342 0.663153 0.0236088 0.09408832