Visualization and polygonal selection in VizBin. Scatter plot visualization in VizBin of a groundwater-derived metagenomic dataset . The manually placed red polygon highlights a selected cluster of interest. The corresponding sequences can be exported for further analysis. Minimal fragment length: 1,000 nt. Point size is proportional to the natural logarithm of sequence fragment length. Opaqueness is proportional to the natural logarithm of coverage (coverage values according to alignment of reads from  to the contigs). A star-like shape highlights contigs annotated to contain the GrpE gene.