Table 1: Results from spectral fitting in the 3-11 keV energy band assuming fixed Galactic $N_{\rm H} = 6.4$ $\times $ 1020 cm-2. The letter f indicates parameters whose value was kept fixed during the model fitting.
  Model $\Gamma$ $E_{\rm {line}}({\rm keV})$ $\sigma $(keV) EW(eV) $E_{\rm {line,2}}({\rm keV})$ $\sigma_2$(keV) EW2(eV) $\chi^{2}_{\rm {red}}$/d.o.f.
PN PL $2.44\pm0.03$ - - - - - - 0.987/631
PN PL+NGL $2.46\pm 0.03$ $\rm 6.67^{+0.08}_{-0.10}$ f(0.1) $44\pm 20$ - - - 0.97/629
PN PL+2 NGLs $2.47\pm 0.03$ f(6.67) f(0.1) $40\pm 20$ $\rm 6.35^{+0.13}_{-0.16}$ f(0.1) $\rm 23^{+17}_{-19}$ 0.966/628
PN PL+BGL $2.47\pm 0.03$ $\rm 6.60^{+0.14}_{-0.15}$ $\rm0.22^{+0.38}_{-0.17}$ $6\rm 6^{+60}_{-32}$ - - - 0.968/628
PN PL+DL $2.47\pm 0.03$ $\rm 6.59^{+0.08}_{-0.09}$ - $76\pm 30$ - - - 0.965/629
PN PL+DL+ABL $2.45\pm 0.03$ $6.6\pm0.1$ - $67\pm 30$ $8.14\pm 0.04$ f(0.01) $-54\pm 20$ 0.94/627
MOS1+2 PL $2.34\pm0.05$ - - - - - - 1.199/257
MOS1+2 PL+NGL $2.36\pm 0.05$ $\rm 7.04^{+0.09}_{-0.11}$ f(0.1) $\rm 81^{+49}_{-43}$ - - - 1.171/255
MOS1+2 PL+2 NGLs $2.38\pm 0.05$ f(7.04) f(0.1) $83\pm 46$ $\rm 6.64^{+0.22}_{-0.28}$ f(0.1) $38\pm 35$ 1.163/254
MOS1+2 PL+BGL $2.38\pm 0.05$ $6.89\pm 0.26$ $\rm0.29^{+0.26}_{-0.11}$ $\rm 138^{+54}_{-70}$ - - - 1.172/254
MOS1+2 PL+DL $2.39\pm 0.05$ $6.76\pm 0.10$ - $\rm 158^{+71}_{-77}$ - - - 1.159/255
MOS1+2 PL+DL+ABL $2.37\pm 0.05$ $6.76\pm0.11$ - $\rm 141^{+75}_{-72}$ $7.91\pm 0.08$ f(0.01) $-62\pm 42$ 1.146/253

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