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Fig. 4


a) Raw time-series light curves of the six stars observed and analysed with the custom designed mask, shown in Fig. 1. b) Raw light curves for WASP-17 and the composite comparison star made from the combination of all reference stars, excluding reference 4. c) Normalised transit light curve for WASP-17b obtained through division of the two plots above and normalised to out-of-transit flux mean. Light curves in panels a) and b) have been shifted for clarity.

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