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Fig. 1
Relative g′, r′, i′ and z′-band photometry of WASP-4 obtained with GROND. The transits occured (for each panel from top to bottom) on UT August 26, August 30 and October 8, 2009. The transit light curves obtained on each successive run are displayed with an offset of 0.025 in relative flux for a better illustration.
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