Free Onion Diagram for PowerPoint is a free presentation template and shapes that you can download for Microsoft PowerPoint presentations.
Inside this presentation template you can find useful onion diagrams with concentric circles and variants of editable Venn Diagrams for Microsoft PowerPoint.
There are many different slide layouts that you can use including circles or oval shapes for PowerPoint and legend so you can describe the content inside the diagram.
Alternatively you can download other free PowerPoint presentations and slide designs including free PowerPoint shapes for Microsoft PowerPoint 2010 and 2013.
License: cc by 2.0 
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