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+.PS
+# ex05DPV.m4
+darrow_init
+
+Kalman: [
+ fillval = 0.8
+
+ boxht = 0.35
+ boxwid = 1.5*boxht
+ dx = boxht/5
+ circlerad = boxht*3/8
+ extlen=4*dx
+ indel = boxht/3
+ define(`dlthick',dlthick*3/4)
+
+define(`overbar',`line right textht*0.8 \
+ with .c at last box.c + ((`$1')*textht,0.7*textht)')
+
+COb: box fill_ "CO"; overbar(0.5)
+CO:box fill_ with .nw at last box.se+(dx,-dx) "CO"
+CbOb: box fill_ with .nw at last box.se+(dx,-dx) "CO"
+ overbar(-0.5); overbar(0.5)
+CbO: box fill_ with .nw at last box.se+(dx,-dx) "CO"; overbar(-0.5)
+
+ 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_;
+SB: shadebox(box wid NE.x-SW.x ht NE.y-SW.y with .sw at SW)
+
+U: COb.w-(3*dx+extlen,0)
+ {"svg_it(U)" wid 0.1 rjust at U}
+ dline(from U 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
+ dline(to (CbOb.w,Here)); 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)
+ dline(from Dum.w to (SB.w-(0.1,0),Dum)); darrow(to (U,Here))
+ {"svg_it(Y)" rjust}
+ move left 0.23
+
+ circle at Sum
+ circle at Dum
+ ]
+Coxeter: [
+# Coxeter.m4
+
+ customlinethick = 1.5
+
+ linethick = customlinethick
+ define(`dotrad_',`(3/2*linethick pt__)')
+
+ Orig: (0,0)
+ for i=0 to 4 do { P[i]: dot(at (i*linewid,0)) }
+ line from Orig to P[4]
+ P[-1]: dot(at (Rect_(linewid, 120))); line to Orig
+ P[-2]: dot(at (Rect_(linewid,-120))); line to Orig
+
+ Pa: dot(at P[4]+(linewid,0)); "svg_it(a)" at last [].n above
+ arrow from P[4] to Pa chop linewid/4
+ Pd: dot(at Pa+(linewid,0)); "svg_it(d)" at last [].w rjust
+ Pe: dot(at Pd+(linewid,0)); "svg_it(e)" at last [].n above
+ Pf: dot(at Pe+(linewid,0)); "svg_it(f)" at last [].n above
+ Pb: dot(at Pd+(Rect_(linewid,120))); "svg_it(b)" at last [].w rjust
+ Pc: dot(at Pd+(Rect_(linewid,-120))); "svg_it(c)" at last [].w rjust
+ line from Pb to Pd then to Pc
+ line from Pd to Pf
+
+ define(`customarc',
+ `pushdef(`dfillcolor',`0.7,0.7,0.7') linethick_(0.4); dnl
+ Darc(`$1',linewid, (`$2')*dtor_, (`$3')*dtor_,
+ thick=linewid/6; wid=linewid*0.3; ht=linewid/6; ends=<->)dnl
+ linethick_(customlinethick); popdef(`dfillcolor')')
+
+ customarc((linewid,-linewid/3), 25,155)
+ "svg_it(d)" at (linewid,linewid*2/3)
+ customarc((2*linewid,-linewid/3), 25,155)
+ "svg_it(e)" at (2*linewid,linewid*2/3)
+ customarc((3*linewid,-linewid/3), 25,155)
+ "svg_it(f)" at (3*linewid,linewid*2/3)
+ customarc(Orig,130,230); "svg_it(a)" at (Rect_(linewid,180))
+ customarc(Orig, 10,110); "svg_it(b)" at (Rect_(linewid, 60))
+ customarc(Orig,-110,-10); "svg_it(c)" at (Rect_(linewid,-60))
+
+ ] with .sw at Kalman.se+(15bp__,0)
+.PE