> > But the arrow with curve is not clear as arrows with line.
> > What will be the reason?
> >
> > \ncarc[arcangle=-50,border=1pt]{1,2}{1,1}^{9}
>
> border=1pt is the problem. choose arrowscale=5 and you'll see
After removing border option I am getting proper output.
Thanks a lot.
-Manjusha