Methods of analyzing three dimensional data sets obtained from a sample over time are provided. In one embodiment of the construction technique, stringer portions of the modules are longitudinally telescoped with one another and then intersecured so that the interfitted modules form successive longitudinal portions of the assembled staircase structure. The helice pier post broadly includes a top mounting plate, a hollow tubular casing, a first pipe shaft with a first helice mounted thereon. The source follower in the bitline boost circuit is configured to clamp the voltage of an input signal at substantially the same level as the clamping devices, and to provide additional current to shorten the period for charging parasitic capacitance.