Fig. 3
a) Observed O viii Lyβ/Lyα ratios obtained with the XIS (red), the MOS field IV (green), field V (blue), and field VI (cyan) plotted against the best-fit temperatures. The solid line is the Lyβ/Lyα versus temperature curve calculated by the CIE model, and the dashed line shows the Lyβ/Lyα versus collision velocity by the CX model. b) Same as panel a), but for the O viii (Lyγ + Lyδ + Lyϵ + Lyζ)/Lyβ ratio.
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