.PS
.ps 20
## figure 17
boxwid = (5 * .75) * boxwid
boxht  = 1.5 * boxht
##
B1:     box shaded
B2:     box shaded with .n at (B1.s.x, B1.s.y-lineht) \
                "\normalsize PRESENTATION"
        line from B1.s to B2.n "\ data structures" ljust
##
boxwid = boxwid / 5
boxht =  boxht / 2
B1a:    box with .nw at (B1.nw.x+boxwid/2, B1.nw.y-boxht/2) "ACSE"
B1b:    box with .n at (B1.n.x, B1.n.y-boxht/2) dashed "$\ldots$"
B1c:    box with .ne at (B1.ne.x-boxwid/2, B1.ne.y-boxht/2) "ROSE"
##
B4:	box with .sw at (B2.e.x + boxwid,B2.e.y) height 6 * boxht \
						 width  3 * boxwid \
		"\normalsize ABSTRACT" "" "\normalsize SYNTAX"
##
.PE