Problem with SetRangeUser in TGraphErrors drawing

[cmerlass]

Dear Root experts,
I’m observing a graphic problem while trying to plot a TGraphErrors with error bands (I’m using root_v6.11.02)
My plot looks fine if I don’t touch the axis ranges, but when I try to change them I end up with this:

(unfortunately the forum doesn’t let me upload two pictures)

I use the following code for changin the axis:

graph_vec.at(0)->GetXaxis()->SetRangeUser(600, 1800);
graph_vec.at(0)->GetYaxis()->SetRangeUser(0, 80);

(but the same behaviour happens if I do it by hand with the mouse from the canvas)

and these line for the drawing:

graph_vec.at(0)->Draw("a4");
graph_vec.at(0)->Draw("same c X");

I think it is an extrapolation problem, since everything work fine if I use:

graph_vec.at(0)->Draw("a3");

Do you have any suggestion on how to fix this?
I also attach a root file with the raw TGraph, maybe it could help
laserprofile.root (12.8 KB)

Many thanks for your help,
Claudia

[couet]

@cmerlass

(unfortunately the forum doesn’t let me upload two pictures)

you should load them one by one.

I am looking at you problem now. I might well be that in that case the clipping of the polygon is wrong.

[couet]

Yes you should use A3 as explained here.

I made the following macro:

void cmerlass() {
   auto f = new TFile("laserprofile.root");
   auto *g = (TGraphErrors*)f->Get("Graph");
   g->SetFillColor(kBlue-10);
   g->GetXaxis()->SetRangeUser(600, 1800);
   g->GetYaxis()->SetRangeUser(0, 60);
   g->Draw("a3");
   g->Draw("c X");
}

I get this picture:

and by the way I get the same picture with A4

[cmerlass]

Thanks!
In the end I found a range that is good for my plot and for which the figure doesn’t break even with a4. I just wanted to report that it may be a bit unstable, I agree that “a3” is a safer option.

Cheers,
Claudia

[couet]

@cmerlass

In the end I found a range that is good for my plot

Well, the ranges you sent me work both with A3 and A4… may be you have an old ROOT version in which there was a problem. I am using the master and it is fine.