Calculated travel times (in days, colored lines) and the observed cycle times for the early M stars from Fig. 1 as a function of rotation period. The cycle times are always shorter than the calculated travel times, i.e., always τ ≲ 1. The data for the Sun are shown for comparison. Colors as in Fig. 3. For GJ476 (blue bar) the cycle period is known but not the rotation period.
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