Figure 4
From: A new strategy for better genome assembly from very short reads
It illustrates the criteria for selecting reliable A-contigs. In the middle is the target genome which takes two genomes A and B as references. Because of divergent regions between the target and reference genomes, mis-assembled contigs A and B were produced. For mis-assembled contig A, a DBG contig fails to align to it; for mis-assembled contig B assembled against reference A, because the best mapped reference contig of DBG contig 3 is the bona fide contig B, its coverage of DBG contigs is smaller than the one assembled against reference B.