Hi,
You can also run the Labtalk Script in Script Window with your graph activated:
dpi = 600;
page.unit=1;
page.height=9*dpi;
page.width=7*dpi;
layer.unit=2;
layer.height=5;
layer.width=3;
layer.left = (page.width/dpi - layer.width)/2;
layer.top = (page.height/dpi - layer.height)/2;
James