====== Set the range of the x axis in a TGraph ======
===== Problem =====
If you have a TGraph, SetRangeUser will not work for the x axis.
<code C++>
TGraph* myGraph = new TGraph();
...
myGraph->SetRangeUser(lower,upper);
</code>
will not complain but also not do anything. Or not the thing you want.

You have to use SetLimits(), like:
<code C++>
TGraph* myGraph = new TGraph();
...
myGraph->SetLimits(lower,upper);
</code>