How to make a TH2D histrogram with a multi-column .txt file

ROOT
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I have a .txt file where the power is in the first column and the x position is in the second column and the y position is in the third column. I want to create a TH2D histogram of the position (x,y) as a function of energy. Can anyone help me?

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Maybe a better idea would be to try: TGraph2D

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