Files in this Data Supplement:

• Supplemental file 1 - Legends to Fig. S1 to S3.
  MS Word document, 22K.
• Supplemental file 2 - Additional analyses of the three putative circular genomic components reconstructed from soil viral metagenomic sequences (Fig. S1).
  Zipped PDF file, 35K.
• Supplemental file 3 - Alignment of the amino acid sequences from Rep_Viral domains obtained in this study and related members with those domains (Fig. S2).
  Zipped PDF file, 42K.
• Supplemental file 4 - Alignment of the amino acid sequences from Gemini_AL3 domains obtained in this study and related members with those domains (Fig. S3).
  Zipped PDF file, 23K.