[Rivet] filling ntuple

[Inês Ochoa]

Hi,

I am running a Rivet routine and would like to write out a TTree with a 
few of the variables I'm calculating. Is this supported?

The only example I can find is 
https://rivet.hepforge.org/trac/attachment/ticket/95/ExampleTree.hh, but 
it is a bit old and I am having problems running it (using athena).

Thanks in advance,
Inês