In one embodiment, a fluid ejection device is configured to receive a signal and ejecting fluid in response thereto, including an ink ejecting nozzle layer having a substrate with first and second surfaces joined along an edge, an insulating feature located on the first surface adjacent the edge and a flexible lead that bends around the edge and lies flush against the insulating feature. The method comprises receiving data inputs from one or more sensors in the physical security system, with the monitored area being overlaid with a grid defining a plurality of locations. Motivation for this method is that straightforward application of the Hilbert Transform followed by taking the derivative of the phase-angle as the Instantaneous Frequency leads to a common mistake made up to this date. Any one of a number of pigment compounds may be utilized in the temporary aqueous aerosol paint composition, including fluorescent colored pigment compounds, thereby permitting use in a variety of applications. Each of the socket members defines a recess, which extends into the end walls of the floating structures.