# Type of error on TGraphError

Hi everybody.

I’m new using root TGraphErrors and I trying to plot data with assymetric errors
on x and y axis. I can do this, but the error bar don’t make sense, so, remembering
issues on gnuplot with this, I remember I need to sum or not the error, depending if
the error was relative of absolute.

With which work root?? I don’t find it on the documentation.

Cheers.

Antonio

Hi,

ROOT’s point uncertainties are absolute ones.

Cheers, Axel.

[quote=“Axel”]Hi,

ROOT’s point uncertainties are absolute ones.

Cheers, Axel.[/quote]

Thanks Axel, I gonna to have on mind always.

Cheers.

[quote=“Pepe Le Pew”]TGraphErrors
TGraphAsymmErrors
TGraphBentErrors[/quote]

And

Pepe Le Pew Thanks, previously I see the documentation, but I’m not see the kind of error of the data parameters.

Thanks both.

Cheers.

Antonio.