Currently the evolution graphs don't have icons below the graph. We could - show the "simple table" icon to show the table version of the graph - show the "export" link to export the data in Xml/json/php/csv
See also #624 to add an icon to save the graph as PNG.
just did the export link as pdf/html/json/etc. adding the "show as table" would be a bit more work but not necessary at this stage.