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. 2015 Jan 30;10(1):e0117210. doi: 10.1371/journal.pone.0117210

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Fig 4 — Correlation matrices comparing viral taxa to bacteria at the Family level. The color and size of the cross-referenced circles corresponds to the level of correlation between groups. The legend indicates correlations (r values) ranging from-1 (strong negative correlation) to +1 (strong positive correlation).