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Fig. 5


Monitoring of color and magnitude variations on the (ur,r) diagram for CTTS (magenta lines) and WTTS (blue lines) in NGC 2264 on a timescale of weeks. Each bar represents a single object: the center of the bar is located at the color and r-band magnitude of the object at the median luminosity state, while the amplitudes along ur and r mark the total amount of variability detected during the CFHT monitoring (i.e., (ur)max − (ur)min and rmaxrmin  over the 10th95th percentiles range, respectively). The effects of reddening on the diagram are traced by the black arrow in the top right corner (Fiorucci & Munari 2003).

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