TChain with trees cointained in subdirectory in each file

I have a set of files that cointaines the tree i want to chain in a subdirectory instead of the main directory.
How can i chain them ?

Use the directory name in the treename. Either

TChain *c = new TChain("mydir/mytree");or c->AddFile(filename,"thatdir/thattree");Cheers,
Philippe