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.PS
# ex05.m4
darrow_init
fillval = 0.8 # environmental variable
dx = boxht/5 # diagram parameters wrt scaled env variables
circlerad = boxht*3/8
extlen=4*dx
indel = boxht/3
# Replacement for \bar, see
# https://tex.stackexchange.com/questions/22100/the-bar-and-overline-commands
command "\newcommand{\ols}[1]{%
\mskip.5\thinmuskip\overline{\mskip-.5\thinmuskip {#1} \mskip-.5\thinmuskip}%
\mskip.5\thinmuskip} % overline short "
COb: box fill_ "C$\ols{\mbox{O}}$"
CO:box fill_ with .nw at last box.se+(dx,-dx) "CO"
CbOb: box fill_ with .nw at last box.se+(dx,-dx) \
"$\ols{\mbox{C}}$$\ols{\mbox{O}}$"
CbO: box fill_ with .nw at last box.se+(dx,-dx) "$\ols{\mbox{C}}$O"
dline(from CbO.s down_ dx,,t,,!-)
dright
{Sum: circle invis at (CO,Here)}
darrow(to Sum.e)
SW: (COb.w,Sum.s)+(-3*dx-extlen/2,-dx)
NE: (CbO.e,COb.n)+(dx,dx)
right_; shadebox(box wid NE.x-SW.x ht NE.y-SW.y with .sw at SW)
U: "\bf u$\,$" rjust at COb.w-(3*dx+extlen,0)
dline(right_ extlen+dx,,t,,|-)
TU: dtee(R)
{darrow(to COb.w,t)}
dline(to (Here,CO),t,t)
{Dum: circle invis at (Here,Sum)}
dtee(L)
{darrow(to CO.w,t)}
{D: box "D" wid boxwid/2 ht boxwid/2 at 0.5<Here,Dum.n>}
darrow(to D.n,t)
darrow(from D.s to Dum.n,,,,,,!-)
dline(up_ from CO.n to (CO,COb)-(0,indel),,t,,!-)
dleft; darrow(to (COb.e,Here))
dline(up_ from CbOb.n to (CbOb,COb),,t,,!-)
dleft; darrow(to COb.e)
dline(from CbO.n-(indel,0) up_ CbOb.y-CbO.n.y,,t,,!-)
dleft; darrow(to CbOb.e)
dline(up_ from CbO.n to (CbO,CO),,t,,!-)
dleft
darrow(to CO.e)
dline(up_ from CbO.n+(indel,0) to (CbO,COb)+(indel,indel),,t,,!-)
dleft; darrow(to (COb.e,Here))
darrow(from CO.s to Sum.n,,,,,,!-)
darrow(left_ from Sum.w to Dum.e)
darrow(from Dum.w to (U,Dum))
{"{\bf y$\,$}" rjust}
move left 0.23
circle at Sum
circle at Dum
.PE
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