Fig. 4
Centroid energy of the phase averaged cyclotron resonance line feature in Her X-1 since its discovery. Data from before 1997 were originally compiled by Gruber et al. (2001), where the original references can be found. The data after 1997 are from observations by RXTE, INTEGRAL (Klochkov et al. 2006, 2008a; Staubert et al. 2007) and Suzaku (Enoto et al. 2008), plus recent values as given in Table 2. Here only values measured at 35d phases <0.20 are shown.
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