This article has an erratum: [https://doi.org/10.1051/0004-6361/201936026e]
Variability detection efficiency (F1 max score) as a function of the number of points in the light curve. The simulated variability was injected into the WFC3_F775W filter observations of M4. The data set is heavily affected by cosmic rays, resulting in the poor performance of σw compared to the robust indices MAD and IQR.
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