Comparison of the MBv200 m library to other viral metagenomic libraries by reciprocal BLAST analyses. Each library is represented as a white circle, in the center of which appears the library name, the number of sequences (un-normalized), and the average read length. The relative distances between each library and MBv200 m (solid connecting lines) were calculated by BLAST queries of each library against the Monterey Bay library to determine the number of hits per 100 read-length-normalized sequences in the query library. In each case, the normalized number of hits (numbers adjacent to the lines) was converted to a relative distance by taking its reciprocal. The areas of the white circles represent 100% of the sequences in each library and the areas of the colored circles within represent the read-length-normalized proportion of that library's sequences that had a significant hit when queried with the other library by BLAST.