| http://www.w3.org/ns/prov#value | - For example, the trajectories could be displayed passing through selected isopotential maps in the manner shown in FIG. 6. [0046] A major advantage of the invention is that the graphical presentation of the positional or other variation of the chosen characteristic with time gives more useful information to the clinician than a single isopotential or isointegral map, and can be much more rapidly p
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