.PS 6.5i
.ps 20
lineht	=	3*lineht/2
## figure A-2
B1:	box "$\cdots$" width 9*boxwid/2 height 7*boxht/2
B2:	box "ASE$_{1}$" with .w at (B1.w.x+boxwid/4, B1.c.y) width 4*boxwid/3
B3:	box "ASE$_{n}$" with .e at (B1.e.x-boxwid/4, B1.c.y) width 4*boxwid/3
	box invis with .n at B1.n "application entity" height B1.width/6
	line down from B1.s
##
B4:	box "$\cdots$" width 9*boxwid/2 height 7*boxht/2 \
	    with .w at (B1.e.x+7*linewid, B1.e.y)
B5:	box "ASE$_{1}$" with .w at (B4.w.x+boxwid/4, B4.c.y) width 4*boxwid/3
B6:	box "ASE$_{n}$" with .e at (B4.e.x-boxwid/4, B4.c.y) width 4*boxwid/3
	box invis with .n at B4.n "application entity" height B4.width/6
	line down from B4.s
##
B7:	box "PRESENTATION" with .nw at (B1.sw.x, B1.sw.y-lineht) \
		width B4.se.x-B1.sw.x
##
	line from B1.e to B4.w dashed
	move to ((B1.e.x+B4.w.x)/2, B1.e.y) \
	    "\begin{tabular}{c} application protocol\\ \ \\ over association\end{tabular}"
##
.PE