.00truecm> \setplotarea x from 0 to 00, y from 0 to -0  \setsolid \setlinear \plot 0 0 00 0 / \plot 0 0 0 -0 / \put {\vector(0,0){0}} [Bl] at 00 0 \put {\vector(0,0){0}} [Bl] at 0 0  \setquadratic \plot 0.00 0.0  0.0 0.0  0 0.0 / \plot 0 0.0  0.00 0.0  0.0 -0.0 / \plot 00.00 0.00 00.0 0.0 00.0 0.000 /  \setlinear \put {\vector(0,0){0}} [Bl] at 00.0 0.000 \put {\vector(0,-0){0}} [Bl] at 0.000 -0.0  \put {${\rm n}^0$} at 0 0.0 \put {${\rm n}^0$} at 00.0 0.0 \put {$({\rm N}_0^0, {\rm N}_0^0)$} at 0.0 -0.0 \put {$({\rm N}_0^0, {\rm N}_0^0)$} at 00.0 0.0  \setplotsymbol ({\circle*{0.0}} [Bl]) \plotsymbolspacing0mm \setdots <0mm> \plot 0 0.0  00.0 0.0 / \plot 0 0.0  00.0 0.0 / \plot 0 0.0  00.0 0.0 / \plot 0 0.0  00.0 0.0 / \plot 0 0.0  00.0 0.0 / \setsolid  \put {{\bf FIG. 0} \ \ A two-dimensional dicrete domain.} at 0 -0