Plotting Histogram from Two Column of Data

Newbie
1

I have two column of data - Energy (x-axis) and Flux (y-axis) - in a txt file. I am trying to plot the histogram but I am having trouble in filling up a data. Please let me know the error in my code and how to deal with it. Thank you/

{
TNtuple t("Flux_data", "Data from DUNE", "Energy:Flux");
t.ReadFile("data.txt");

// manually created histogram
TH1F h("Flux_Hist","Energy vs. Flux", 100, 0, 40);
h.Fill("Energy");
h.Fill("Flux")
h.Draw();
}
2 
{
   auto t = new TNtuple("Flux_data", "Data from DUNE", "Energy:Flux");
   t->ReadFile("data.txt");
   t->Draw("Energy:Flux");
}
3

This one does not work. It only gives me scatterplot.

4

What do you want ?