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Fig. 4. —Box-and-whiskers plots. Graph shows contrast-to-noise ratio in electron-beam CT coronary angiography for different coronary vessel segments. Bottom and top edges of box are 25th and 75th percentiles, horizontal line represents the median, and error bars delimit extent of 10th and 90th percentiles. No statistical differences were observed, and this type of plot effectively portrays this data variability. LM = left main coronary artery, LAD = left anterior descending coronary artery, LCX = left circumflex coronary artery, RCA = right coronary artery, p = proximal segment, m = middle segment, d = distal segment. (Reprinted from [6])