| http://www.w3.org/ns/prov#value | - In the illustration in FIG. 2 of a portion of an embodiment of the shading calibration strip 12, locations on the shading calibration strip 12 corresponding to locations from which the reference values of the output signal of the optical sensing element may be obtained while relatively moving the scan bar, including the optical sensing element, over the shading calibration strip 12 are shown as ci
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