Table 3: Density and temperature determination, from the line ratios $R_{\rm D}=f/i$ and $R_{\rm T}=(i+f)/r$, for the analysed He-like triplets.
  Obs. 2000  
Ion $R_{\rm D}$ Ne $R_{\rm T}$ $\log T$ (K) $\log T_{\mathrm{max}}$ (K)
O VII $3.5\pm0.6$ < $1\times10^{10}\,\rm cm^{-3}$ $0.95\pm0.08$ $6.22\pm0.08$ 6.3
Ne IX $3.2\pm0.8$ < $2\times10^{11}\,\rm cm^{-3}$ $1.08\pm0.10$ $6.21\pm0.12$ 6.6
Mg XI $2.2\pm0.4$ $(2.0^{+2.0}_{-0.9})\times10^{12}\,\rm cm^{-3}$ $0.79\pm0.08$ $6.64\pm0.09$ 6.8
Si XIII $2.0\pm0.5$ < $2.0\times10^{13}\,\rm cm^{-3}$ $0.73\pm0.08$ $6.78\pm0.11$ 7.0
  Obs. 2001  
Ion $R_{\rm D}$ Ne $R_{\rm T}$ $\log T$ (K) $\log T_{\mathrm{max}}$ (K)
O VII $3.6\pm0.6$ < $1\times10^{10}\,\rm cm^{-3}$ $0.98\pm0.09$ $6.18\pm0.08$ 6.3
Ne IX $2.5\pm0.6$ $(1.8^{+2.5}_{-1.3})\times10^{11}\,\rm cm^{-3}$ $1.00\pm0.10$ $6.29\pm0.12$ 6.6
Mg XI $2.4\pm0.5$ $(1.5^{+1.7}_{-1.3})\times10^{12}\,\rm cm^{-3}$ $0.87\pm0.09$ $6.54\pm0.12$ 6.8
Si XIII $3.1\pm1.0$ < $9\times10^{12}\,\rm cm^{-3}$ $0.78\pm0.11$ $6.71\pm0.14$ 7.0

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