A first data product that can be read into a computer or a map data processing apparatus, contains therein map data having map-related information of a map. The motor vehicle door is maintained in the open position by a shock absorberpiston arrangement that is common in the automotive industry. A t-nut secured to one of the metal plates in alignment with its hole. In some methods, the interfacial region is formed after formation of an electrochromic and a counter electrode layer. The computer aided design system projects points on the two dimensional polar vision plot onto a three dimensional surface of the transparency taking into account the observer’s head position and the refraction of light caused by the transparency. The techniques can apply to multiple signals and can apply to a wide variety of modulation schemes or combinations thereof.