CLAS physics database search results Measurement E216M220 CLAS12 Run Group A Krishna Chandra 2018 psi(pi-) dsigma/dpsi_pim Stat. error Syst. error deg mcbn/rad mcbn/rad mcbn/rad 18 0.578722 0.0181137 0.07298772 54 0.649711 0.0292398 0.06755963 90 0.637708 0.014364 0.05257276 126 0.680854 0.0144291 0.05402753 162 0.789534 0.0149498 0.06246052 198 0.779418 0.0127885 0.05918 234 0.71074 0.0145134 0.05557323 270 0.632847 0.0162268 0.0533269 306 0.596929 0.0148604 0.06946554 342 0.670145 0.0446255 0.07639725