| http://www.w3.org/ns/prov#value | - While the foregoing horizontal alignment procedure is directed to horizontal alignment for bidirectional printing with both cartridges, horizontal alignment for unidirectional printing by both cartridges can be achieved with procedures similar to those set forth in FIGS. 15A through 15C and FIGS. 16A through 16C. After calibration of the optical sensor 65, background values for the test area are d
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