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BSD 4.3reno

\def\mservice{[RFC 1006]}
\def\tpservice{[ISO 8073]}
\def\tcpservice{[MIL 1778]}
.PS 5.75i
.ps 20
lineht	=	3*lineht/2
## figure 2b
B1:	box "TS-user"
	line down from B1.s
B3:	box "TS-provider" "(client)"
	line down from B3.s
B5:	box invis
##
B2:	box "TS-user" with .w at (B1.e.x+3*linewid, B1.e.y)
	line down from B2.s
B4:	box "TS-provider" "(server)"
	line down from B4.s
B6:	box invis
##
	line dashed from (B1.w.x-linewid/2, (B1.s.y+B3.n.y)/2) \
		    to	 (B2.e.x+linewid/2, (B2.s.y+B4.n.y)/2)
	move to (B2.e.x, (B2.s.y+B4.n.y)/2) \
	    "\begin{tabular}{r}TSAP interface\\ \tpservice\end{tabular}" ljust
##
	line dashed from (B3.w.x-linewid/2, (B3.s.y+B5.n.y)/2) \
		    to	 (B4.e.x+linewid/2, (B4.s.y+B6.n.y)/2)
	move to (B4.e.x, (B4.s.y+B6.n.y)/2) \
	    "\begin{tabular}{r}TCP interface\\ \tcpservice\end{tabular}" ljust
##
	line from B3.e to B4.w dashed \
	    "\begin{tabular}{c} {\em magic box\/} protocol\end{tabular}" \
	    "\begin{tabular}{c}\ \\ \mservice\end{tabular}"
##
B7:	box "DoD TCP" with .nw at B5.nw width (B6.ne.x-B5.nw.x)
##
.PE

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