Notes. The information is approximately ordered by time, and similar cases are grouped together. For observations covering multiple binary orbits, the information is split to show each consecutive data set within one orbital period. The orbital phase range here is calculated based on the mid-eclipse time in Kreykenbohm et al. (2008), see Table 3, and may accordingly differ from the values given in the original publications. The uncertainty in this conversion is typically 2–3 × 10⁻³. The same observations have sometimes also been used in further publications that are not explicitly listed in this table. As examples, Tenma observations have also been shown in Nagase et al. (1986), while the Chandra observations used by Goldstein et al. (2004) have been also used in Watanabe et al. (2006), Grinberg et al. (2017), and Rahin & Behar (2020).