CLAS physics database search results Measurement E216M310 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.589592 0.0359706 0.09176173 54 0.555083 0.0227498 0.06629117 90 0.592186 0.0160979 0.04786545 126 0.591835 0.0204696 0.04435995 162 0.612515 0.0148723 0.04607879 198 0.609851 0.0153298 0.04511599 234 0.59212 0.0241774 0.04646722 270 0.630554 0.0361076 0.05568118 306 0.546828 0.0303507 0.06302283 342 0.594186 0.0495429 0.08895492