Distribution of descriptor values for NSR and CHF subjects. The distribution of descriptors are shown using Box-whiskers (BW) plot (without outliers) of (a) log(SD 1), (b) log(SD 2) and (c) log(CCM) for Normal Sinus Rhythm (NSR, n = 54) and Congestive Heart Failure (CHF, n = 29) subjects. From panel a, it is apparent that boxes (interquartile range) of normal and CHF subjects are overlapping. The BW of normal subjects is completely overlapped with the box and whisker (lower quartile) of the CHF subjects. In panel b, boxes are apparently non-overlapped. But the BW plot of normal subjects mostly overlaps with the whisker (upper quartile) of the CHF subjects. In panel c, the BW plot of log(CCM) is shown to be non-overlapping and only the upper quartile (box) and whisker of normal subjects are overlapped with the whisker (lower quartile) of the CHF subjects.