hist and density on the same plot

Hi
I would like to plot hist and density associated on the same graph.
I don't find the code.
Any suggestions ?

--
Michel ARNAUD
CIRAD TA60/15
73, av. Jean Fran?ois Breton
34938 MONTPELLIER CEDEX 5
tel : 04 67 59 38 34
Fax : 04 67 59 38 38

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