CLAS physics database search results Measurement E216M832 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.101092 0.0226838 0.02579676 54 0.0974305 0.00919322 0.01176051 90 0.0852556 0.00612915 0.00730787 126 0.105562 0.00646326 0.00877756 162 0.105996 0.00627033 0.00881851 198 0.102503 0.00664646 0.00823678 234 0.0948894 0.0062874 0.00893319 270 0.0904347 0.00830652 0.00744154 306 0.100809 0.0159727 0.01179689 342 0.0885748 0.0079183 0.01430791