CLAS physics database search results Measurement E216M958 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.0576006 0.00819319 0.01866882 54 0.0686993 0.00906878 0.00781301 90 0.0684372 0.00753665 0.00596979 126 0.0804634 0.00670676 0.00643216 162 0.0890638 0.00773912 0.00827986 198 0.0797663 0.00703012 0.00676251 234 0.0821797 0.00749925 0.00752876 270 0.0694068 0.0100665 0.00626984 306 0.0640066 0.00821603 0.00710072 342 0.0581751 0.0106679 0.00827177