CoRoT thumbnails, i.e., target-centered CCD subimages, for CoRoT-30. The photometric mask for the target stars appears in white. The white crosses indicate the locations of the neighboring stars retrieved from Exodat. Top image: observed data. Middle image: noise-free computed data. Bottom image: same as the middle one without the target PSF to clearly show the contamination by neighboring stars. We note the significant contamination for CoRoT-30.