| http://www.w3.org/ns/prov#value | - Referring to FIG. 1, a top region 28 of the spacer 14 includes a layer of electrically insulating material, such as silicon dioxide or a fluoropolymer, such as TEFLON. Similarly, referring to FIG. 2, a top region 30 of the spacer 15 includes a similar insulating layer.
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