usr/src/contrib/mh-6.8.3a/papers/trusted/figure1.pic

.PS 5.9i
## figure 1
C1:     ellipse "\UA/"
B1:     box "\MTA/" with .n at (C1.s.x, C1.s.y-3*lineht)
B8:     box "\MTA/" with .w at (B1.e.x+linewid, B1.e.y)
B2:     box invis "$\ldots$" with .w at (B8.e.x+linewid, B1.e.y)
B9:     box invis "$\ldots$" with .w at (B2.e.x+linewid, B1.e.y)
B3:     box "\MTA/" with .w at (B9.e.x+linewid, B1.e.y)
C2:     ellipse "\UA/" with .s at (B3.n.x, C1.s.y)
##
        arrow from C1.s to B1.n
        arrow from B1.e to B8.w
        arrow from B8.e to B2.w
        arrow from B2.e to B9.w
        arrow from B9.e to B3.w
        arrow from B3.n to C2.s
##
B4:     box width B3.e.x+linewid/3-(B1.w.x-linewid/3) \
            height 3*boxht \
            with .c at B2.c
        move to (B4.n.x, B4.n.y-lineht/2); "\MTS/"
##
        line dashed "POSTING" "" \
                from (B4.w.x-linewid, B4.n.y+lineht/2) \
                to   (C1.s.x, B4.n.y+lineht/2)
        line dashed "RECEIPT" "" \
                from (B4.e.x+linewid, B4.n.y+lineht/2) \
                to   (C2.s.x, B4.n.y+lineht/2)
        move to ((B2.e.x+B9.w.x)/2, B2.s.y); "RELAYING"
##
.PE