Fig. A.1.
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Fe K line properties of thermal emission spectrum. Top-left: Line centroid energy as a function of gas temperature; Top-right: Line intensity ratio of Fe XXVI and Fe XXV as a function of gas temperature. The dashed-line indicates the observed line ratio with 68% error region in grey shade; Bottom-left: Fe XXV EW as a function of temperature when the Solar metallity is assumed; and Bottom-right: Fe XXV EW as a function of metallicity for gas temperature of kT = 3 keV (blue) and kT = 5 keV (red).
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