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Figure 2 Comparison of ^99mTc-3,3-diphosphono-1,2-propanodicarboxylic acid heart retention (A), whole-body retention (B), and heart/whole-body retention ratio (C) between group A patients (transthyretin [TTR]-related cardiac amyloidosis [CA]), group B patients (monoclonal immunoglobulin light-chain [AL] cardiac amyloidosis), and controls. The lower/upper limits of the boxes indicate 25th/75th percentiles; horizontal lines (and values) within boxes indicate medians. Values lying more than 1.5 and 3 box-lengths from the 75th percentile are indicated by circles and asterisks, respectively.