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Figure 1 Histogram showing the distribution of plasma brain natriuretic peptide (BNP) in subjects with left ventricular systolic function (LVSD) (solid bars, right y-axis) and without LVSD (open bars, left y-axis). The x axis is logarithmically scaled to approach normality. The interval 1–2 means  1.0 and  2.0; the interval 2 to 4 means >2.0 and 4.0, etc. The y axis contains the number of subjects with a plasma value within the specified interval. EF = ejection fraction.
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