Hi Danilo
Thanks for the reply and the code. Yes I tried without the lhcbStyle() and it worked but since I am collaborating with LHCb researchers I wanted to format it that way.
Also I was just about the open another topic related to RDataFrame. When I write a script I have to include <ROOT/RDataFrame.hxx> as I saw in this topic Using RDataFrame in C++ but it says ROOT/RDataFrame.hxx not found and writing the scope resolution operator ROOT::RDataFrame also does not work. Would appreciate any help with this. Thanks