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Figure 4 Plot of percentage change in segment diameter versus control (vertical axis) ranked by decile from the most constricted to the most dilated (horizontal axis). Data for infusion of Ach 10^–4M presented. Note that the most constricted segments improved after lipid lowering while those that dilated showed less dilation or mild constriction. See text for discussion. Ach = acetylcholine. Open square = prelipid-lowering; closed circle = postlipid-lowering.