Big axis label is cutoff

Is attach root file has TGraph2D, and is attach script. Run script, give plot but axis label is cut-off. Yes, label big, but need big. How fix to set more space for label? Thanks.

-Dom
toto.C (779 Bytes)
toto.root (2.62 KB)

c1->SetRightMargin(0.09);
c1->SetLeftMargin(0.15);
c1->SetBottomMargin(0.15);

Ah, is many thanks!

-Dom