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1. In facsimile systems, the relationship between the density of the recorded copy and the density of the object, i.e. , the original. (188) 2 . In facsimile systems, the relationship between the amplitude of the facsimile signal to either the density of the object or the density of the recorded copy when only a portion of the system is under consideration. Note: In an FM facsimile system, an appropriate parameter other than the amplitude is used.