| http://www.w3.org/ns/prov#value | - In a set of four screens, one for black, one for blue, one for red, and one for yellow, it is the practice, for example to employ dots disposed on lines 75 105 45 and 90, from the horizontal, the dots, while varying in intensity, all have the same pitch in any one set of screens, as for example 60, 120, 133 or 150 to the inch depending on the degree of refinement desired.
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