Plot graph from excel with single X-axis and multiple y-axis

I want to plot a graph with single x-axis and 6 columns of y-axis. No.of values in each column are upto 1024. How can I read data from excel or csv or text file and plot graph. Please help me. Thank you in advance.

To read each one:
https://root.cern/doc/master/classTGraph.html#ab902beb9e0463b225f0f384b6826a434
And to draw all together:
https://root.cern/doc/master/classTMultiGraph.html

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