Left: distribution of the individual extinctions of all disk-less members. We separately plot those for sources in the central cluster, northern group, and in the sparse population. The vertical lines mark the median and the 25% and 75% quantiles of each distribution. Right: extinction map in the ACIS field. The red lines mark the emission level at 8.0 μm from IRAC images. The green boxes roughly delimit the central and northern groups.