A reference signal is transmitted on multiple non-contiguous clusters of resources. The span has brackets for attaching to the bone. Each of the flanges has a circular array of selectively useable locking apertures therein. Each document state in the plurality of document states identifies at least one end user allowed to access the document and at least one action that can be performed on the document. The crosstalk model for each victim net includes the victim net’s estimated resistances and capacitances and incorporates the aggressor model of each aggressor net section that is proximate to a section of the identified victim net. The fibers are conductive and heat by resistive heating when electric current is passed through the fibers by the apparatus.