Multiple Data Point Graph

I have three data point file and I want to read these data from file and than I want to draw data point graph
But I dont know that how I can draw data point graph with from file
(I want to draw like it )

You should take a look at the TMultiGraph class. Some examples are given therein.

But My file is complex You can access here in my file
And I cant read my file (I want to draw graph 1 for N ,graph 2 for v,graph 3 for Bz

You should read your file in some C++ vectors and build le graphs with them. Reading the file is purely a C++ matter… nothing ROOT specific.

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