| http://www.w3.org/ns/prov#value | - Rather, there is an independent bidirectional current source for each of the sixteen electrodes.) Through appropriate control of the switching matrix 188, when used (FIG. 4A), or through operation of the independent bidirectional current sources, when used (FIGS. 4B and 4C), any of the m current source nodes 187 may be connected to any of the electrode nodes E1, E2, E3, . . .
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