[R] To represent on the same plot the relation (y1, x) and (y2, x)

[Arnaud Michel]

Hello,
I have 3 vectors x, y1 and y2
I would like to represent on the same plot the two graph (y1, x) and 
(y2, x).
Is it possible with ggplot ? other package ?
Thanks for your help

-- 
Michel ARNAUD
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