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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) width 1.5*boxwid height 5*boxht
B3:	box "user" "application" \
	    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 "rtse" with .e at (B3.e.x,B3.se.y-(B3.se.y-B4.nw.y)/2) \
	    width 1.25*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,B5.n.y)
L3a:	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)
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)




#B1:     box "user" width 3*boxwid
#B2:     box "PCI" with .ne at (B1.sw.x, B1.sw.y-lineht)
#B3:     box "PDU" with .nw at (B2.sw.x, B2.sw.y-lineht) width 4*boxwid
#        line from B1.s to (B1.s.x, B3.n.y)
#        line from B2.s to (B2.s.x, B3.n.y)
#B4:     box "ICI" with .e at B3.w dashed
#B5:     box "IDU" with .nw at (B4.sw.x, B4.sw.y-lineht) width 5*boxwid dashed
#B6:     box "ICI" with .nw at (B5.sw.x, B5.sw.y-lineht) dashed
#B7:     box "SDU" with .w at B6.e width 4*boxwid
###
#        line dashed from B5.e to (B5.e.x+3*linewid, B5.e.y)
#        move to (B5.e.x+3*linewid, B5.n.y); "layer-N" rjust
#        line dashed from B5.w to (B5.w.x-3*linewid, B5.w.y)
#        move to (B5.e.x+3*linewid, B5.s.y); "layer-(N-1)" rjust
##
.PE

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