Devices for sensing gradients are constructed from material whose properties change in response to gradients. The enlarged pocket areas can be created by forming an artificial sinus adjacent the valve structure in an unsupported section of vessel wall between two support frame section or the support frame can comprise an expanded-diameter intermediate or proximal section that forms an artificial sinus adjacent the valve structure. The method may be applied to small objects and small font text objects. The third bond pad area includes at least one tab portion extending laterally from an edge of the third bond pad area to shadow an area on the substrate including the exposed end of the interconnect line abutting the edge of the first bond pad area. Image processing is performed to correct the flaws in the physical image information to form a corrected physical image. Additionally, records from each first meter are marked to reflect a sequence in which they are generated, thereby ensuring that the collector will store the most recent data records available.