Variation of the observed X-ray fluxes derived with XSPEC for the ROSAT, Chandra, and XMM-Newton observations in the energy band 0.5−2 keV. 1ROSAT observation 2 446 928.585, 2ROSAT observation 2 449 508.604. The phase 0 has been arbitrary chosen to the oldest ROSAT observation. We did not use the T0 derived by Annuk (1990) because they strongly depend on the line considered. The period has been fixed to P = 1521.1 d. Error bars are related to the relative error of the count rate (see text).
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