.PS 7.5i
.ps 20
## figure 5
B1:	box "SESSION SERVICES" width 3*boxwid
B2:	box "PRESENTATION SERVICES" width 3*boxwid with .sw at B1.nw
B3:	box "ASN.1" with .se at (B1.ne.x+boxwid, B1.ne.y+boxht/2) \
		height 2*boxht
B7:	box "\xx DIRECTORY" "\xx SERVICES" with .se at B2.ne \
		width 3*boxwid/5
B4:	box "\yy ASSOCIATION" "\yy CONTROL" with .ne at B7.nw \
		width 3*boxwid/5
B6:	box "\yy COMMITMENT" "\yy CONCURRENCY" "\yy AND RECOVERY" \
		with .ne at B4.nw width 3*boxwid/5
B8:	box "\xx REMOTE" "\xx OPERATIONS" with .ne at B6.nw width 3*boxwid/5
B9:	box "\xx RELIABLE" "\xx TRANSFER" with .ne at B8.nw width 3*boxwid/5
##
	line from B2.nw \
	     to (B2.nw.x, B3.n.y+boxht/2) \
	     to (B3.nw.x, B3.n.y+boxht/2) \
	     to B3.nw
B5:	box invis width 3*boxwid height B3.n.y+boxht/2-B2.nw.y \
	    with .sw at B2.nw
	move to (B5.n.x, B5.n.y-lineht/2); "APPLICATION (SASE)"
##
.PE