A data visualization interactivity architecture may be provided. By providing an electroconductive member which adheres to the electrode through a hole and seals the hole, the formation of a hermetic lead-in terminal is made to be easy. A air spring assembly may include a first air spring mount mounted to move with the rod, a second air spring mount on the second support element, and a tubular air spring mounted on the first and second air spring mounts and defining a air spring interior to hold a quantity of air. The display unit includes a display screen configured to display a first characteristic sign illustrating the speed vector and a second characteristic sign illustrating the longitudinal margin of maneuver. Also a method for initializing phase change material on a continuous web which will be used to manufacture a plurality of recording media.