Dear Galaxy list,

I am interested in Galaxy Charts visualization.But venn diagram confuses me when I upload my tabular data, it seems venn diagram need  one column observations at least, actually I don't clear what should be contained in the one column observations.
 
So is there any venn diagram example data or usage for this charts plugin ? Sad to say I am not good at JavaScript :)

Thank you very much.

Regards,
Steven