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Fig. 2

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Folded NTT-EFOSC2 I-band photometry of the central star of Hen 2-11 with the nightfall model overlaid in red (upper panel). Binned residuals between the observed photometry and model are shown in the lower panel. Note that the size of the points represents the photometric uncertainty and contain no estimate of the uncertainty due to variable nebular contamination (which can be significant, see text for details).

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