Disk fraction as a function of radial position for the X-ray-selected young stars with (filled red circles) and without (open blue circles) disks, subject to the mass and extinction requirements discussed in the text. The top plots are centered on the O7V star HD 217086, while the bottom lots are centered on V454 Cep, a B1V star at the center of the western sub-cluster. The disk fraction is determined within each annuli, which are separated by 2′. Note that the disk fraction in the outer annulus of the western sub-cluster is increased by the small grouping of stars with disks between the two sub-clusters.