Fig. 13.
Evolution of the X-ray luminosity of the K dwarf in V471 Tau from the observations summarized in Table 1. The duration of the selected quiescent ranges is color-coded. Solid error bars denote flux errors (see text); dotted bars are the estimated cross-calibration uncertainty. The blue dashed line indicates the best fit with a sinusoidal function with a period of ∼12.7 yr.
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