The subject system provides reduced-dimension mapping of pattern data. The apparatus can be mounted on a wall in public places or at home. An anchor is mounted or mountable on the second end of the flexile member for irremovably anchoring the second end of the flexible member to a second exterior wall of the spa, opposite the first exterior wall of the spa. The first connecting terminal of the first switch is used to receive the initial voltage, the second connecting terminal of the first switch is used to receive the power supply voltage, and the third connecting terminal of the first switch is coupled to one of the first connecting terminal and the second connecting terminal. Other aspects of the invention include various implantable medical devices, such as pacemakers, defibrillators, and cardioverters, incorporating one or more features of the exemplary feedthrough assembly.