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Initial revision

.PS
.ps 20
## figure A-15

boxwid	= 2*boxwid

B1:	box "user"
B2:	box with .n at (B1.s.x,B1.s.y-boxht/1.5) width 1.5*boxwid height 5*boxht
B4:	box "session" with .sw at B2.sw width 1.5*boxwid
B3:	box "UA" \
	    with .n at (B2.n.x,B2.n.y-(B2.n.y-B4.n.y)/6) width 1.25*boxwid height boxht
B5:	box "MTA" \
	    with .s at (B2.n.x,B4.n.y+(B2.n.y-B4.n.y)/6) width 1.25*boxwid height 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,B5.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.sw.x-(B1.sw.x-B1.s.x)/2,B5.s.y) \
	          to (B1.sw.x-(B1.sw.x-B1.s.x)/2,B4.n.y)
L6:	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)
##
B21:	box invis with .nw at (B1.ne.x+(B2.ne.x-B2.nw.x),B1.nw.y)
B22:	box with .n at (B21.s.x,B3.s.y-(B3.s.y-B5.n.y)/2) width 1.5*boxwid \
		height (B3.s.y - B2.s.y) - (B3.s.y-B5.n.y)/2 
B24:	box "session" with .sw at B22.sw width 1.5*boxwid
B25:	box "MTA" with .s at (B22.c.x,B5.s.y) width 1.25*boxwid
B26:	box invis "$\ldots$" with .nw at B22.sw width 1.5*boxwid
##
L25:	line <-> from (B21.sw.x-(B21.sw.x-B21.s.x)/2,B25.s.y) \
	          to (B21.sw.x-(B21.sw.x-B21.s.x)/2,B24.n.y)
L26:	line <-> from (B21.se.x-(B21.se.x-B21.s.x)/2,B25.s.y) \
	          to (B21.se.x-(B21.se.x-B21.s.x)/2,B24.n.y)
##
B11:	box "user" with .nw at (B21.ne.x+(B22.ne.x-B22.nw.x),B21.nw.y)
B12:	box with .n at (B11.s.x,B11.s.y-boxht/1.5) width 1.5*boxwid height 5*boxht
B14:	box "session" with .sw at B12.sw width 1.5*boxwid
B13:	box "UA" \
	    with .n at (B12.n.x,B12.n.y-(B12.n.y-B14.n.y)/6) width 1.25*boxwid height boxht
B15:	box "MTA" \
	    with .s at (B12.n.x,B14.n.y+(B12.n.y-B14.n.y)/6) width 1.25*boxwid height 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,B15.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.sw.x-(B11.sw.x-B11.s.x)/2,B15.s.y) \
	          to (B11.sw.x-(B11.sw.x-B11.s.x)/2,B14.n.y)
L16:	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)
##
L30:	line <-> dashed from B3.e to B13.w "P2" ""
L31:	line <-> dashed from B5.e to B25.w "P1" ""
L32:	line <-> dashed from B25.e to B15.w "P1" ""
##
.PE

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