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Fig. 1
Count rates in several energy bands of ζ Pup, and associated hardness ratios for XMM-Newton data from 2003–2006. The phases were calculated using P = 1.780938 d and T0 = 2 450 000 (Howarth & Stevens 2014). To facilitate the comparisons, the ratio between upper and lower limits of the y-axes are all equal.
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