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1.1 root 1: .PS
2: .ps 20
3: ## figure 13
4: B1: box "SDU" width 3*boxwid
5: B2: box "PCI" with .ne at (B1.sw.x, B1.sw.y-lineht)
6: B3: box "PDU" with .nw at (B2.sw.x, B2.sw.y-lineht) width 4*boxwid
7: line from B1.s to (B1.s.x, B3.n.y)
8: line from B2.s to (B2.s.x, B3.n.y)
9: B4: box "ICI" with .e at B3.w dashed
10: B5: box "IDU" with .nw at (B4.sw.x, B4.sw.y-lineht) width 5*boxwid dashed
11: B6: box "ICI" with .nw at (B5.sw.x, B5.sw.y-lineht) dashed
12: B7: box "SDU" with .w at B6.e width 4*boxwid
13: ##
14: line dashed from B5.e to (B5.e.x+3*linewid, B5.e.y)
15: move to (B5.e.x+3*linewid, B5.n.y); "layer-N" rjust
16: line dashed from B5.w to (B5.w.x-3*linewid, B5.w.y)
17: move to (B5.e.x+3*linewid, B5.s.y); "layer-(N-1)" rjust
18: ##
19: .PE
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