.PS
.ps 20
## figure E-9
B1:	box "TP4"
B2:	box "CLNP" with .n at B1.s
B3:	box "X.25" with .n at B2.s
##
S1:	box with .nw at (B2.ne.x+linewid/2, B2.ne.y) \
		height B2.ne.y-B3.se.y width boxwid/6 shaded
	move to S1.e; "\ CLNS" ljust
##
.PE