st: How to add lines in graph?

[Yingge Lin <stataq@gmail.com>]

Hi, guys,

I would like to add two lines in the graph produced by "graph7 meanti
foodratio , twoway box".one is the mean value of "meanti", the other
is foodratio=0.5. How can I do these?

Thanks in advance.

Best, 
Yingge

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