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_F467M filter observations of M4. Unlike the F775W data (Fig. A.2), the F467M data are not heavily affected by cosmic rays. Under such conditions, σw performs better than the robust indices MAD and IQR for light curves having a small number of points.
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