An apparatus, method, system, and signal-bearing medium may provide multiple maps, which may include multiple probing sequences to be called upon at run-time based on statistical thresholds or other selected criteria. It includes a body in which is defined a reaction area capable of containing a reaction medium, at least one inlet for introducing the reaction medium into the reaction area, one outlet for discharging effluents out of the reaction area. An array of memory cell capacitors is formed within the well.