| http://www.w3.org/ns/prov#value | - y way of example only, with reference to the accompanying drawings, in which: [0016]FIG. 1 is a diagram of a first embodiment excitation signal suitable for use in a system and method according to the present invention, having a serially-applied AC component and DC component. [0017]FIG. 2 is a diagram of a second embodiment excitation signal suitable for use in a system and method according to the
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