Fig. 13.
Examples of stars with a compound behavior are shown inside color-color diagrams or color-magnitude diagrams. 1- Asymmetry with a distinct color; 2- Variable IR-excess; 3- Changing slope; 5- Mix of 2 and 3. Dark red arrows show the effect of interstellar reddening for AV = 1 mag. The color of each data point reflects its observational date following the color-bar in Fig. 4.
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