Fig. 18.

X-ray activity against Rossby number Ro = P/τc for NGC 2516. Single stars are shown with filled symbols, while known binaries (of all separations) are displayed with open symbols. Square symbols indicate the gap stars (Ro ≈ 0.06) that are in transition from fast- to slow rotation. The dotted lines indicate the alternative positions of the two possible alias periods in our sample.
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