| http://www.w3.org/ns/prov#value | - Rather, there is an independent bi-directional 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 bi-directional 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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