diff -r 75a13d812a10 -r e1f53a68b146 docs/figures/figure-sg05.svg
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/docs/figures/figure-sg05.svg	Mon Dec 09 23:54:50 2019 +0100
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
+ "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+<!-- Generated by graphviz version 2.40.1 (20161225.0304)
+ -->
+<!-- Title: Mercurial graph Pages: 1 -->
+<svg width="224pt" height="116pt"
+ viewBox="0.00 0.00 224.00 116.00" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+<g id="graph0" class="graph" transform="scale(1 1) rotate(0) translate(4 112)">
+<title>Mercurial graph</title>
+<!-- 0 -->
+<g id="node1" class="node">
+<title>0</title>
+<polygon fill="none" stroke="#000000" stroke-width="4" points="72,-108 0,-108 0,-72 72,-72 72,-108"/>
+<text text-anchor="middle" x="36" y="-86.3" font-family="mono" font-size="14.00" fill="#000000">0:0dc9</text>
+</g>
+<!-- 1 -->
+<g id="node2" class="node">
+<title>1</title>
+<polygon fill="none" stroke="#000000" stroke-width="4" points="216,-108 144,-108 144,-72 216,-72 216,-108"/>
+<text text-anchor="middle" x="180" y="-86.3" font-family="mono" font-size="14.00" fill="#000000">1:7b49</text>
+</g>
+<!-- 0&#45;&gt;1 -->
+<g id="edge1" class="edge">
+<title>0&#45;&gt;1</title>
+<path fill="none" stroke="#000000" stroke-width="2" d="M72.3373,-90C90.9973,-90 113.9327,-90 133.8329,-90"/>
+<polygon fill="#000000" stroke="#000000" stroke-width="2" points="133.9241,-93.5001 143.924,-90 133.924,-86.5001 133.9241,-93.5001"/>
+</g>
+<!-- T1 -->
+<g id="node3" class="node">
+<title>T1</title>
+<text text-anchor="start" x="17" y="-15.3" font-family="mono" font-style="italic" font-size="14.00" fill="#000000">only the final version</text>
+</g>
+<!-- T1&#45;&gt;1 -->
+<g id="edge2" class="edge">
+<title>T1&#45;&gt;1</title>
+<path fill="none" stroke="#c0c0c0" stroke-width="2" d="M126.1686,-36.1686C134.7152,-44.7152 145.0557,-55.0557 154.3802,-64.3802"/>
+<polygon fill="#c0c0c0" stroke="#c0c0c0" stroke-width="2" points="152.0408,-66.9905 161.5867,-71.5867 156.9905,-62.0408 152.0408,-66.9905"/>
+</g>
+</g>
+</svg>