N50 and total length of the assemblies produced by ABySS with different k-mers. Every odd number starting from 45 to 87 were used as k-mer sizes, and different assembly strategies were compared. For example, AF refers to the use of reads from the AF sample for assembly, whereas AFSFASSS refers to the use of reads from all four samples together. A) N50, B) total length. The total length of each assembly is shown on a logarithmic scale.