CLAS physics database search results Measurement E216M607 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.173494 0.00914369 0.01966274 54 0.196699 0.0101028 0.01759425 90 0.216831 0.00825461 0.01735308 126 0.251074 0.00866441 0.01981053 162 0.283107 0.0077959 0.02030211 198 0.317589 0.00989234 0.02339305 234 0.261626 0.00824435 0.02040848 270 0.215146 0.0103178 0.01692143 306 0.192876 0.0108408 0.01789476 342 0.206733 0.0170597 0.02536713