| http://www.w3.org/ns/prov#value | - As a further alternative, shown in FIG. 7 f, the channel 16 may have two sidewall surfaces 74 that extend from the substrate 22 and join at an acute or rounded peak 71 so as to define a substantially triangular cross section 75, as opposed to the rectangular cross sections illustrated herein, such as the cross section of the thin layer 60.
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