Make the x/y-axis closer to the border of canvas?

ROOT
1

Hi, how can I make the frame of a histogram (x-axis as the lower frame, and y-axis as the left fram) closer to the border of the canvas ? thanks a lot!

2 
   TCanvas *c1 = new TCanvas("c1", "c1",200,28,700,500);
   c1->SetLeftMargin(0.03);
   c1->SetRightMargin(0.043);
   c1->SetBottomMargin(0.050);