How to setting the space between arrow in quiver function?

Hi, I'm plotting a graph using quiver. But the i want to adjust the space between arrows.

axis equal; axis([xmin xmax ymin ymax]); quiver(Px,Py,aPx,aPy); hold on quiver(Qx,Qy,aQx,aQy);

[José-Luis]

What do you mean the space between arrows?