| http://www.w3.org/ns/prov#value | - o a plurality of pixels having graded optical densities to distinguish the pixels which correspond to the section a, to thereby obtain the length a, which originated from the aforementioned overlap between the substrate box 13 and the overlying top box 15 on the x-axis, and (3) by repeating this procedure for all other areas including sections b, c and d, the lengths b, c and d were obtained.
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