A method for non-invasive mapping of the electrical impedance of an object. A slide element is guided by the at least one column between a retracted position and an extended position. The impact target arrangement is attached to the head restraint arrangement and moveably attached to the frame. The articulated well bore is horizontally offset from the substantially vertical well bore at the surface and intersects the substantially vertical well bore at a junction proximate to the subterranean zone. Partial-page data is packed and sector mapped by sub-sector mapping tables that are pointed to by a unified mapping table that stores the data-type bits and pointers to data or tables in DRAM.