A door jamb square made of two extensions, a vertical extension and a horizontal extension. In accordance with a first embodiment of the present invention, a leakage efficient anti-glitch filter with variable delay stages comprises a plurality of variable delay stages and a coincidence detector element for detecting coincidence of an input signal to the delay element and an output of the delay element. Such aggregates are cationic, and able to form stable complexes with anionic macromolecules, such as nucleic acids. The temperature gradient of the surface covering is adjusted such that there is a temperature gradient difference between the foamed and nonfoamed regions. In another embodiment, the shaped pole pieces include portions of varying thickness to provide varying magnitudes of magnetic flux density along the length. The control circuit is configured to selectively provide the latch control signal to trigger latching by the second multi-bit flip-flop dependent on a running comparison of the output code of the digital filter and the value of individual ones of the multi-bit sigma-delta ADC codes from the series of multi-bit sigma-delta ADC codes.