CLAS physics database search results Measurement E216M247 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.481591 0.0221622 0.0526337 54 0.465485 0.0149235 0.04284859 90 0.467168 0.0121329 0.03868213 126 0.620473 0.0166021 0.04789159 162 0.755119 0.0224545 0.06455767 198 0.745986 0.0163967 0.05501642 234 0.618383 0.0260313 0.0516214 270 0.547005 0.0179432 0.04410981 306 0.464347 0.0145959 0.04397709 342 0.471989 0.0146099 0.04989103