Fig. 6.
Combined line significance of an O VII−O VIII pair detection for different WHIM absorber redshifts as a function of the hydrogen column density in the Milky Way galaxy for an afterglow flux of Fstart = 5 × 10−11 erg cm−2 s−1and O VII line equivalent width of EWO VII = 0.28 eV. Error bars represent the 1σ scatter among the 10 simulated spectra.
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