A method for determining the presence of a leak in a pressure system. The emergence cuff is receivable on the post of the abutment and has an outer surface configuration which merges confluently with the abutment outer surface. In another aspect of an apparatus or method for transmitting data, a phase modulation may be imposed on a carrier signal in accordance with a data signal to create a modulated signal having a carrier and sidebands, where the amount of phase modulation being selected is such that the amplitude of the sidebands is substantially lower than that of the carrier. The method further includes causing an event. The via hole pattern is thereafter etched through the anti-reflective coating layer, the dielectric layer, and the etch stop layer to form a via hole.