TGraph: more space for y-axis label

ROOT
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Hi all,
a very short question for you, I think:
Look at the enclosed picture. They are four TGraph objects.
As you can see y-axis labels are not visible, at all.

In the top-left pad I tried to set a 0.1 offset, but now they are overwritten by the graph itself.

Can you suggest me a way to improve it?
Can I enlarge the label space on the left of each pad? Can I force the labels to be written over the graph?

many thanks!
anna

O2008sla_homing_05sep07_094109_homing_plot.gif673×649 43.9 KB

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gPad->SetLeftMargin(0.15); //15 per cent of pad for left margin, default is 10%
graph.GetYaxis()->SetTitleOffset(1.2);

Rene