clip a SpatialPolygonsDataFrame

hi,

i would like to know how to clip a map ("france") that i loaded with the
function readShapePoly. Now, it's a SpatialPolygonsDataFrame. 

I want to clip the map "france" according to specific coordinates in order
to obtain a new map corresponding to a specific part of the original map
(for example the eastern part of France).

Can someone help me ?
thanks

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