Fig. 6.
Correlation tests between a sinusoid with three cycles in 20 days and a random (upper left panel), constant (upper right panel), correlated (bottom left panel), and anti-correlated (bottom right panel) simulated X-ray light curve. The red points show how the sinusoid is sampled, and the black points mark the simulated X-ray photon fluxes. The results of the Spearman two-ranks correlation test are shown above each panel.
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