Multiple ascii files

Hello, I have multiple (3) ascii files I would like to histogram from, each with 6 columns of data.

Is there some way to read in all 3 files into a ROOT macro? All the examples I find only are concerned with one ascii file, but I would like to, for instance, superimpose a column from one file onto the data from a second file’s column on a root histogram. Can this be done? If so, how? Thank you!

Yes it can be done. You probably need to create 3 different trees and make the 3 tree to be ‘friend’ of each other. See TTree::ReadFile and TTree::AddFriend.