CLAS physics database search results Measurement E216M616 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.172176 0.00959281 0.01908692 54 0.161717 0.0126531 0.01391403 90 0.195716 0.0104459 0.01722255 126 0.230277 0.00814537 0.01758667 162 0.291845 0.00837727 0.0210878 198 0.302567 0.00837399 0.02220166 234 0.248611 0.010313 0.01828475 270 0.208513 0.00930875 0.01714715 306 0.179399 0.00828592 0.01631401 342 0.177898 0.0149766 0.02108772