Light curve of CoRoT-9 during the transit of CoRoT-9b on June 18, 2010. Each dot represents an individual photometric measurement. Large squares show the data measurements rebinned by 40. The thick red line shows the best fit with an exoplanet transit model. The bottom panel gives the residual of the measurements after subtraction of the best fit model. The two vertical dashed lines represent the time range of the estimated time of the photometric bump that could be due to the transit in front of a stellar spot. The data taken within this time range have been excluded from the analysis.