The X-axis represents the length of sequencing reads (after log conversion), and the Y-axis represents the number of reads with the corresponding length. Under normal circumstances, the average length of DNA we can obtain is more than 10,000 bp (different according to different special requirements), reflecting the main peak of the measured read length distribution in the figure to the right of 10,000 bp.

The X-axis represents the length of reads (the upper curve of the figure is the estimated distribution of read length and nuclear density), and the Y-axis represents the read sequencing quality (the curve on the right of the figure is the estimated distribution of reads sequencing quality> quantity nuclear density). The picture is a two-dimensional (length, quality) nuclear density estimation map. In theory, the higher the core, the better the sequencing quality of most reads, and the narrower the vertical distribution (especially the core area).It shows that the quality of sequencing is more stable.