forgot to add to index

doc/paper/threads.svg

+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="210mm"
+   height="297mm"
+   viewBox="0 0 744.09448819 1052.3622047"
+   id="svg2"
+   version="1.1"
+   inkscape:version="0.91 r13725"
+   sodipodi:docname="threads.svg">
+  <defs
+     id="defs4">
+    <marker
+       inkscape:stockid="TriangleOutL"
+       orient="auto"
+       refY="0.0"
+       refX="0.0"
+       id="TriangleOutL"
+       style="overflow:visible"
+       inkscape:isstock="true">
+      <path
+         id="path4344"
+         d="M 5.77,0.0 L -2.88,5.0 L -2.88,-5.0 L 5.77,0.0 z "
+         style="fill-rule:evenodd;stroke:#000000;stroke-width:1pt;stroke-opacity:1;fill:#000000;fill-opacity:1"
+         transform="scale(0.8)" />
+    </marker>
+    <marker
+       inkscape:stockid="TriangleInL"
+       orient="auto"
+       refY="0.0"
+       refX="0.0"
+       id="TriangleInL"
+       style="overflow:visible"
+       inkscape:isstock="true">
+      <path
+         id="path4335"
+         d="M 5.77,0.0 L -2.88,5.0 L -2.88,-5.0 L 5.77,0.0 z "
+         style="fill-rule:evenodd;stroke:#000000;stroke-width:1pt;stroke-opacity:1;fill:#000000;fill-opacity:1"
+         transform="scale(-0.8)" />
+    </marker>
+  </defs>
+  <sodipodi:namedview
+     id="base"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageopacity="0.0"
+     inkscape:pageshadow="2"
+     inkscape:zoom="1.42"
+     inkscape:cx="440.04559"
+     inkscape:cy="905.35211"
+     inkscape:document-units="px"
+     inkscape:current-layer="layer1"
+     showgrid="false"
+     showguides="true"
+     inkscape:guide-bbox="true"
+     inkscape:window-width="1280"
+     inkscape:window-height="700"
+     inkscape:window-x="0"
+     inkscape:window-y="0"
+     inkscape:window-maximized="1" />
+  <metadata
+     id="metadata7">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     inkscape:label="Ebene 1"
+     inkscape:groupmode="layer"
+     id="layer1">
+    <rect
+       style="fill:#ffffff;stroke:#000000;stroke-width:0.85379028;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       id="rect4136"
+       width="298.77875"
+       height="256.58997"
+       x="25.258507"
+       y="32.550289" />
+    <rect
+       style="fill:#ffffff;stroke:#000000;stroke-width:0.85379028;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       id="rect4136-8"
+       width="298.77875"
+       height="256.58997"
+       x="398.37009"
+       y="32.659641" />
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-weight:normal;font-size:27.5px;line-height:125%;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       x="110.52632"
+       y="73.414833"
+       id="text4155"
+       sodipodi:linespacing="125%"><tspan
+         sodipodi:role="line"
+         id="tspan4157"
+         x="110.52632"
+         y="73.414833">Thread 1</tspan></text>
+    <text
+       xml:space="preserve"
+       style="font-style:normal;font-weight:normal;font-size:27.5px;line-height:125%;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       x="487.17804"
+       y="73.246864"
+       id="text4159"
+       sodipodi:linespacing="125%"><tspan
+         sodipodi:role="line"
+         id="tspan4161"
+         x="487.17804"
+         y="73.246864">Thread 2</tspan></text>
+    <rect
+       style="fill:#ffffff;stroke:#000000;stroke-width:0.84493136;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
+       id="rect4165"
+       width="248.47194"
+       height="134.67883"
+       x="50.476677"
+       y="138.47107" />
+    <flowRoot
+       xml:space="preserve"
+       id="flowRoot4167"
+       style="font-style:normal;font-weight:normal;font-size:27.5px;line-height:125%;font-family:sans-serif;letter-spacing:0px;word-spacing:0px;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1"
+       transform="translate(39.158028,-24.46936)"><flowRegion
+         id="flowRegion4169"><rect
+           id="rect4171"
+           width="149.42529"
+           height="79.310349"
+           x="91.954025"
+           y="210.98289" /></flowRegion><flowPara
+         id="flowPara4173">Stage</flowPara></flowRoot>    <rect
+       style="fill:#ffffff;stroke:#000000;stroke-width:0.845;stroke-miterlimit:4;stroke-dasharray:6.76,6.76;stroke-opacity:1;stroke-dashoffset:0"
+       id="rect4165-9"
+       width="248.47194"
+       height="134.67883"
+       x="424.35559"
+       y="138.54393" />
+    <path
+       style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:1.01553023px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;marker-start:url(#TriangleInL);marker-end:url(#TriangleOutL)"
+       d="m 303.65486,156.5406 c 46.21197,-17.99288 82.65513,-13.45945 115.2274,0"
+       id="path4196"
+       inkscape:connector-curvature="0"
+       sodipodi:nodetypes="cc" />
+  </g>
+</svg>