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Fig. 2. —Example of graph with high data-ink ratio that portrays related data in one presentation. Multivariable graph depicts attenuation versus time for several tissues after contrast injection. Conspicuity (•) and attenuation of liver ({square}), tumor ([UNK]), aorta ({blacktriangleup}), and portal vein ({blacksquare}) are plotted. Phases of hepatic enhancement are also illustrated. (Reprinted from [4])