Top left: mass histogram of all CTTS with CoRoT light curves (black), stars with AA Tau-like light curves (red), and stars whose CoRoT light curves are dominated by aperiodic extinction events (purple). Top right: number of AA Tau-like stars (red) and aperiodic extinction stars (purple), divided by the total number of CTTS observed by CoRoT in that mass bin. Stars of both CoRoT observing runs were used, and any star that presented AA Tau-like photometric behavior in either run was included in the AA Tau category. Bottom: number of AA Tau-like stars (red) and aperiodic extinction stars (purple), divided by the total number of CTTS in the sample of Venuti et al. (2014), including those that were not observed by CoRoT.