| http://www.w3.org/ns/prov#value | - According to other embodiments other numbers and types of sensors may be used. [0028] Reference is now made to FIGS. 3A and 3B, which illustrate exemplary output from multiple sensors, for example, from sensors 12A and 12B, respectively (or other sensor described herein, such as sensors 17A-D, 120, 125, 112A-C, etc.), and their cross correlation, respectively, over time.
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