Upper panel: distribution of emission measure vs. electron temperature kTe and ionization age net at t = 340 years derived from run CAS-15MS-1ETA. The white cross shows the ranges of kTe and net values inferred from Chandra observations (Hwang & Laming 2012). Lower panel: corresponding three-color composite image of the emission measure distribution. The colors show the contribution to emission measure from the shocked ejecta (blue), shocked Fe (green), and shocked RSG wind (red). The white crosses mark the values derived by Lee et al. (2014) from the analysis of regions dominated by thermal emission of shocked ambient gas.