Fig. 4
NTT unfiltered photometry of SDSS J0039 obtained over two nights (shown in separate panels). Differential magnitudes for SDSS J0039 minus comparison star are shown as filled circles with error bars, offset by the V magnitude of the comparison. Differential magnitudes for comparison minus check star are shown offset to appear at the bottom of the plot; in most cases the errorbars are smaller than the points.
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