A computationally efficient method for assessing a subject’s autonomic balance by measurement of heart rate variability is disclosed which is particularly suitable for implementation by an implantable medical device. A tillage shank runs a point through the compaction layer to fracture and loosen the soil, forcing it upwardly and outwardly where a pair of angled soil-gathering blades, located adjacent the shank, redirect the soil into a newly created berm. , recessed, portions of a first, low k gap fill material blanket-deposited over spaced-apart features of a metallization pattern and in the spaces therebetween. The tail portions of the contacts project outside the housing and are bent along the rear surface of the supporting portion so as to arrange the tail portions in a substantially vertical position. In vertical second planar sections, to which the optical axis of the projection module extends perpendicularly, the surface of the optical element is concave-shaped, and in vertical planar sections extending parallel to the optical axis, it is convex-shaped. The radio network has a serving mobile location center for locating the user equipment and a second-layer logical link control relay set on the packet protocol stack.