Fig. 3

The correlation between sample age and various measures of sequencing quality, including adapter level, total duplication, total number of sequences, total number of unmapped reads, mean genome coverage, and estimated library size, when reads were aligned to the reference genome. In (a), each bar in the plot represents the strength and direction of correlation, and the R-value is displayed in/on the bars. In (b), the raw data points are plotted for each pair-wise comparison, along with the linear regression trend line. See Table 1 for the detailed statistics