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Table 3

Ion column densities.

Ion log N(cm-2) a
RGS1 RGS2 HRC ACIS

Ne ix 15.96 16.59 15.37
O viib 16.24 15.93 15.86 16.07
O viii 16.03 15.71 15.92 15.70
O v 15.17 15.28 14.40
O iv 15.61 15.68 15.38
O iv (CIE) 15.56 15.51
O i 16.54 16.19
N vi 15.05 14.84 15.23 14.87
N i 15.81 15.56
C vi 15.34 15.41 14.97 15.22

Notes.

(a)

The values are obtained by fitting the data with the slab model, i.e. without an assumption about the ionisation balance, except for O iv, for which we also show the value obtained under CIE assumption. The uncertainties include the systematic uncertainty of 1 mÅ and the allowance of vtot = 20–35 km s-1.

(b)

The value for RGS1, RGS2, and HRC is the weighted mean of the Lyα and Lyβ measurements. RGS2 only covers the Lyβ line.

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