CLAS physics database search results Measurement E216M211 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.562113 0.0249904 0.07536356 54 0.606728 0.0219124 0.0599609 90 0.624253 0.0154642 0.0518958 126 0.711139 0.0155252 0.05711625 162 0.805992 0.0138247 0.06084058 198 0.807511 0.0151437 0.06204115 234 0.725598 0.0146821 0.06109329 270 0.678721 0.0193995 0.05763739 306 0.634663 0.0204378 0.06357912 342 0.564719 0.0246703 0.08258194