st: Venn diagram in circle

[Kingsley Agho <kingsleya@health.usyd.edu.au>]

To whom it may concern,

I am trying to draw venn diagram (circle) in stata 9 but no graph came  
out (pop out). But when I indicated square, it appears.

To get circle, what do I need to do? Below is my command

venndiag alcohol tobacco bzdhx

Many Thanks,

Kingsley


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