Gaussian kernel density estimation of the assigned tags. The x-axis represents the size of the segment STOP-tag. The right and left y-axis do not correspond to the same curve and have different scales. The right y-axis is for the red curve and represents the density of SMAT distances. The left y-axis is for the histogram and represents the tags count in the appropriate segment STOP-tag. Linear binning is used to obtain the bin counts (500) on the x-axis.