Comparison of the calculated R2–R8 for different DEMs (DEM 1: dashed line, DEM 2: dot-dashed line, DEM 3: full line) and κ = 13 with the diagnostics figure for κ = 13 (top), calculated R5–R11 for different DEMs and κ = 11 with the diagnostics figure for κ = 11 (middle), and calculated R2–R8 for different DEMs and κ = 7 with the diagnostics figure for κ = 7 (bottom). The black crosses with the error bars mark observed line ratios in CH, QS, and AR.