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Fig. 6

image

Left panel: zoom into the bottom left panel of Fig. 5. The major peak near P = 0.4 d (blue marker) in the SDEBLS spectrumis a false positive that is caused by an aliasing effect of the discrete cadence-based duration grid employed by most BLS implementations, here using 10 000 trial periods on a linear grid between 0.3 and 5 d. Right panel: same as in the left panel, but now using more than ten times as many trial periods and a nonlinear period grid with the spacing increasing as P1∕3. Although the false-positive peak near P = 0.4 d has disappeared, the signal of K2-32 e near P = 4.3 d is still formally a false negative with SDEBLS = 8.9.

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