Fig. 7
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Relative abundances of iron K to M-shell ions as a function of the ionisation parameter, ξ (lower x-axis) or, equivalently, the distance absorber–X-ray source, d (upper x-axis). The dashed line marks the maximum value of d according to Miškovičová et al. (2016), given in terms of the semi-major axis of the binary system, a = 2.35 R★ (Miller-Jones et al. 2021). For details, see Sect. 5.6.
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