Fig. 1

Sky area around CoRoT-17 (star in the centre). Left: g-filter image with a resolution of 0.7′′ taken with the CFHT telescope. Right: image taken by CoRoT at the same scale and orientation. The jagged outline in its centre is the photometric aperture mask; indicated are also CoRoT’s x and y image coordinates and positions of nearby stars that are in the ExoDat database (Deleuil et al. 2009).
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