TNtuple with double

Dear Rooters,

I am newbie in root!

I would like to use TNtuple with a list of doubles and not float as in
indeed, i have some tags with long precision, so to store them in the tree the float precision is unsufficient. And using the current TNtuple seems to manage only float’s type.
is there any help about that?

thanks in advance.

see TNtupleD


Thank you!