Fig. 2.
Photometric uncertainties (σ) in our time series observations for the relevant filter and exposure time combinations. Top: uncertainties for the two different Ic exposure settings, 60 s (black) and 600 s (grey). Bottom: uncertainties for the 120 s V exposures. In combination, we are able to ensure a measurement precision better than 10 mmag for a large fraction of the observed stars with time series.
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