Hi Zaldy, Simply use this constructor TGraphErrors *errgraph = new TGraphErrors(nbins,xvalues,yvalues,0,yerrors); and don't forget about the 0. Stefan > Dear Rooters, > > how do we implement TGraphErrors using only the y-axis(array)...error > bars...? > not the x-axis(array) > probably I missed to see it in the tutorial... > > > Thanks
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