| http://www.w3.org/ns/prov#value | - Then, as illustrated in FIG. 10B, A1 is a point at which the signal level decreases toward Sl from Sh; A2 is a point at which the signal level reaches Sl; A3 is a point at which the signal level increases toward Sh from Sl; and A4 is a point at which the signal level again reaches Sh.
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