A project management system is enabled to implement filtering, sorting, and field level security for data associated with managed projects. The optical detector outputs detection signals corresponding to the amounts of light incident on the respective regions. Next, in the following step, two end surfaces of the multilayer film and the first gap layers in the track width direction are milled. The interstitching creates a highly effective hermetic seal against moisture leakage along the surface of the bobbin away from the standoff site. The central support is constructed as a round stake which is made of two telescoping sections.