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Latex character #Delta not exported to PDF

Dear experts,

I am plotting a TH1F and simply doing

h->GetXaxis()->SetTitle("#Delta R");

The upper case delta is correctly visualized in the ROOT canvas, but it disappears as soon as I save my plot in .pdf format. On the other hand, I face no problems if I save it as a .png file. Any idea about what’s going on?

Thanks a lot,


I do not see this problem:

root [0] auto t = new TLatex(.5,.5,"#Delta");
root [1] t->Draw()
root [2] c1->Printf("c1.pdf")
root [3] .!open c1.pdf