Draw function curve and data points with error bars in a same graph

ROOT
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Dear all,

As the title, I want to draw function curve and data points with error bars in a same graph.
I am a beginner, thus, I am looking for an example.
Is there anyone know any example about it?

Regards,

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root.cern.ch/doc/master/classTG … rrors.html
root.cern.ch/doc/master/classTGraphErrors.html
root.cern.ch/doc/master/group__ … raphs.html