Fig. 6
JHK excess fraction versus age for the clusters in the CNC. For comparison, we also show JHK excess fractions derived for NGC 2024 and Taurus (Haisch et al. 2000), the Orion Nebula Cluster (ONC, Wolk et al. 2005), IC 348 (Haisch et al. 2001), eta Cha (Lyo et al. 2003), Ori OB 1a and 1b (Briceño et al. 2005). For the case of NGC 6611, we plot the spatial variation of excess fractions from the center of the cluster to the outer parts as derived by Guarcello et al. (2007).
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