Distribution of t_disk as a function of projected separation from σ-Ori. The downward triangles indicate upper limits on M_disk while upward triangles indicate upper limits on Ṁ_acc. The vertical dotted line is located at 0.5 pc from σ-Ori. Targets within 0.5 pc are highlighted with an additional red outline. The dashed lines are related to the estimated age of the cluster, i.e., 3–5 Myr (Oliveira et al. 2004).