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Table 4

Comparison of the photo-ionised and collisional-ionised best-fit model parameters obtained through the C-statistic analysis.

Dataset ism model (hot) Cstat/d.o.f. photo model (xabs) Cstat/d.o.f.

NH kBT σv v NH logξ σv v
1019cm−2 keV km s−1 km s−1 1019cm−2 km s−1 km s−1
RGS/XMM-Newton
008411 8 ± 1 0.14 ± 0.01 100 (f) − 60 ± 40 5379∕3697 17 ± 2 1.86 ± 0.01 100 (f) 5429∕3697
055134 5.5 ± 0.7 0.16 ± 0.01 100 (f) 5370∕3918 7 ± 1 1.72 ± 0.03 100 (f) 5393∕3918

LETG/Chandra
98 5 ± 1 0.17 ± 0.02 100 (f) 20 ± 60 1994∕1839 5 ± 1 1.66 ± 0.11 100 (f) 70 ± 80 2013∕1839
12444 3.6 ± 0.4 0.16 ± 0.01 100 (f) − 190 ± 40 1004∕866 4.2 ± 0.6 1.57 ± 0.09 100 (f) − 160 ± 50 1042∕866

HETG/Chandra
2001 7 ± 2 0.16 ± 0.02 40 ± 30 − 60 ± 30 7328∕6624 10 ± 2 1.74 ± 0.02 50 ± 20 − 60 ± 30 7362∕6624
2006 4.8 ± 0.4 0.16 ± 0.01 150 ± 20 5962∕4984 6.5 ± 0.6 1.72 ± 0.01 6113∕4984

Mean 5.7 ± 0.9 0.16 ± 0.01 95 ± 25 8 ± 1 1.72 ± 0.05

Notes. We indicate with (f) the frozen parameters of the model. The total C-stat/d.o.f. for the ism-model is 27040∕21928 whereas for the photo-model is 27352∕21928.

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