| http://www.w3.org/ns/prov#value | - fields to the coils. [0121] The present invention will be more fully understood from the following detailed description of the preferred embodiments thereof, taken together with the drawings, in which: BRIEF DESCRIPTION OF THE DRAWINGS [0122]FIG. 1A is a schematic side view of a surgical reference element, including fiducial marks and a sensing device, in accordance with a preferred embodiment of
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