saving images

Dear root experts,

I have a small problem when saving canvas in pdf. To explain the problem I have put as attachment the same image in formats eps and pdf. One can appreciate that the floating numbers on the connecting lines are differently placed in the two image formats. Why is it so? The only difference is that in one case I save the file by c1->Print(5-ojw-1.pdf)
and in the other with
c1->Print(5-ojw-1.eps)
On the screen, the image corresponds to the eps one.

Thank you

Giovanni Feverati