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Initial revision

.PS
.ps 20
## figure A-22

boxwid	= 2*boxwid

B0:	box "application"
B1:	box "local mapping" with .n at (B0.s.x,B0.s.y-boxht/1.5)
B2:	box with .n at (B1.s.x,B1.s.y-boxht/1.5) width 1.5*boxwid height 5*boxht
B3:	box "vt" \
	    with .n at (B2.n.x,B2.n.y-(boxht/3)) width 1.25*boxwid height 1.5*boxht
B4:	box "presentation" with .sw at B2.sw width 1.5*boxwid
B5:	box "acse" with .e at (B3.e.x,B3.se.y-(B3.se.y-B4.nw.y)/2) \
	    width .5*boxwid height .75*boxht
B6:	box invis "$\ldots$" with .nw at B2.sw width 1.5*boxwid
##
L1:	line <-> from (B1.sw.x-(B1.sw.x-B1.s.x)/2,B1.s.y) \
	          to (B1.sw.x-(B1.sw.x-B1.s.x)/2,B3.n.y)
L2:	line <-> from (B1.se.x-(B1.se.x-B1.s.x)/2,B1.s.y) \
	          to (B1.se.x-(B1.se.x-B1.s.x)/2,B3.n.y)
L3:	line <-> from (B1.sw.x-(B1.sw.x-B1.s.x)/2,B3.s.y) \
	          to (B1.sw.x-(B1.sw.x-B1.s.x)/2,B4.n.y)
L4:	line <-> from (B1.se.x-(B1.se.x-B1.s.x)/2,B3.s.y) \
	          to (B1.se.x-(B1.se.x-B1.s.x)/2,B5.n.y)
L5:	line <-> from (B1.se.x-(B1.se.x-B1.s.x)/2,B5.s.y) \
	          to (B1.se.x-(B1.se.x-B1.s.x)/2,B4.n.y)
L6:	line <-> from (B1.sw.x-(B1.sw.x-B1.s.x)/2,B0.s.y) \
	          to (B1.sw.x-(B1.sw.x-B1.s.x)/2,B1.n.y)
L7:	line <-> from (B1.se.x-(B1.se.x-B1.s.x)/2,B0.s.y) \
	          to (B1.se.x-(B1.se.x-B1.s.x)/2,B1.n.y)
##
B10:	box "terminal" with .nw at (B0.ne.x+(B2.ne.x-B2.nw.x),B0.nw.y)
B11:	box "local mapping" with .n at (B10.s.x,B10.s.y-boxht/1.5)
B12:	box with .n at (B11.s.x,B11.s.y-boxht/1.5) width 1.5*boxwid height 5*boxht
B13:	box "vt" \
	    with .n at (B12.n.x,B12.n.y-(boxht/3)) width 1.25*boxwid height 1.5*boxht
B14:	box "presentation" with .sw at B12.sw width 1.5*boxwid
B15:	box "acse" with .e at (B13.e.x,B13.se.y-(B13.se.y-B14.nw.y)/2) \
	    width .5*boxwid height .75*boxht
B16:	box invis "$\ldots$" with .nw at B12.sw width 1.5*boxwid
##
L11:	line <-> from (B11.sw.x-(B11.sw.x-B11.s.x)/2,B11.s.y) \
	          to (B11.sw.x-(B11.sw.x-B11.s.x)/2,B13.n.y)
L12:	line <-> from (B11.se.x-(B11.se.x-B11.s.x)/2,B11.s.y) \
	          to (B11.se.x-(B11.se.x-B11.s.x)/2,B13.n.y)
L13:	line <-> from (B11.sw.x-(B11.sw.x-B11.s.x)/2,B13.s.y) \
	          to (B11.sw.x-(B11.sw.x-B11.s.x)/2,B14.n.y)
L14:	line <-> from (B11.se.x-(B11.se.x-B11.s.x)/2,B13.s.y) \
	          to (B11.se.x-(B11.se.x-B11.s.x)/2,B15.n.y)
L15:	line <-> from (B11.se.x-(B11.se.x-B11.s.x)/2,B15.s.y) \
	          to (B11.se.x-(B11.se.x-B11.s.x)/2,B14.n.y)
L16:	line <-> from (B11.sw.x-(B11.sw.x-B11.s.x)/2,B10.s.y) \
	          to (B11.sw.x-(B11.sw.x-B11.s.x)/2,B11.n.y)
L17:	line <-> from (B11.se.x-(B11.se.x-B11.s.x)/2,B10.s.y) \
	          to (B11.se.x-(B11.se.x-B11.s.x)/2,B11.n.y)
##
L20:	line <-> dashed from B3.e to B13.w "VTP" ""
##
.PE

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