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<div class="moz-cite-prefix">Or better, to avoid artfefacts on
boundaries:</div>
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<pre style="font-family:Monospaced;font-style:normal;font-size:12.0;"><span style="color:rgb(0,0,0);">y</span> <span style="color:rgb(92,92,92);">=</span> <span style="color:rgb(50,185,185);">rand</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(188,143,143);">1</span><span style="color:rgb(0,0,0);">,</span><span style="color:rgb(188,143,143);">20</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(0,0,0);">y2</span> <span style="color:rgb(92,92,92);">=</span> <span style="color:rgb(50,185,185);">rand</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(188,143,143);">1</span><span style="color:rgb(0,0,0);">,</span><span style="color:rgb(188,143,143);">20</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(92,92,92);">+</span><span style="color:rgb(188,143,143);">1</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(0,0,0);">y3</span> <span style="color:rgb(92,92,92);">=</span> <span style="color:rgb(50,185,185);">rand</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(188,143,143);">1</span><span style="color:rgb(0,0,0);">,</span><span style="color:rgb(188,143,143);">20</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(92,92,92);">+</span><span style="color:rgb(188,143,143);">2</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(0,0,0);">x</span> <span style="color:rgb(92,92,92);">=</span> <span style="color:rgb(74,85,219);">[</span><span style="color:rgb(188,143,143);">1</span> <span style="color:rgb(188,143,143);">1</span><span style="color:rgb(255,170,0);">:</span><span style="color:rgb(188,143,143);">20</span> <span style="color:rgb(188,143,143);">20</span><span style="color:rgb(74,85,219);">]</span><span style="color:rgb(0,0,0);">;</span>
<span style="color:rgb(0,0,0);">clf</span><span style="color:rgb(0,0,0);">,</span> <span style="color:rgb(0,0,0);">plot</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(0,0,0);">x</span><span style="color:rgb(0,0,0);">,</span> <span style="color:rgb(74,85,219);">[</span><span style="color:rgb(188,143,143);">0</span> <span style="color:rgb(0,0,0);">y3</span> <span style="color:rgb(188,143,143);">0</span><span style="color:rgb(74,85,219);">]</span><span style="color:rgb(74,85,219);">)</span>
<span style="color:rgb(0,0,0);">plot</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(0,0,0);">x</span><span style="color:rgb(0,0,0);">,</span> <span style="color:rgb(74,85,219);">[</span><span style="color:rgb(188,143,143);">0</span> <span style="color:rgb(0,0,0);">y2</span> <span style="color:rgb(188,143,143);">0</span><span style="color:rgb(74,85,219);">]</span><span style="color:rgb(74,85,219);">)</span>
<span style="color:rgb(0,0,0);">plot</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(0,0,0);">x</span><span style="color:rgb(0,0,0);">,</span> <span style="color:rgb(74,85,219);">[</span><span style="color:rgb(188,143,143);">0</span> <span style="color:rgb(0,0,0);">y</span> <span style="color:rgb(188,143,143);">0</span><span style="color:rgb(74,85,219);">]</span><span style="color:rgb(74,85,219);">)</span>
<span style="color:rgb(0,0,0);">gca</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(92,92,92);">.</span><span style="color:rgb(170,170,170);">children</span><span style="color:rgb(92,92,92);">.</span><span style="color:rgb(170,170,170);">children</span><span style="color:rgb(92,92,92);">.</span><span style="color:rgb(170,170,170);">fill_mode</span><span style="color:rgb(92,92,92);"> = </span><span style="color:rgb(188,143,143);">"</span><span style="color:rgb(188,143,143);">on</span><span style="color:rgb(188,143,143);">"</span>
<span style="color:rgb(0,0,0);">gca</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(92,92,92);">.</span><span style="color:rgb(170,170,170);">children</span><span style="color:rgb(92,92,92);">.</span><span style="color:rgb(170,170,170);">children</span><span style="color:rgb(92,92,92);">.</span><span style="color:rgb(170,170,170);">background</span><span style="color:rgb(92,92,92);"> = </span><span style="color:rgb(74,85,219);">[</span><span style="color:rgb(50,185,185);">color</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(188,143,143);">"</span><span style="color:rgb(188,143,143);">grey30</span><span style="color:rgb(188,143,143);">"</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(0,0,0);"> ; </span><span style="color:rgb(50,185,185);">color</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(188,143,143);">"</span><span style="color:rgb(188,143,143);">grey50</span><span style="color:rgb(188,143,143);">"</span><span style="color:rgb(74,85,219);">) </span><span style="color:rgb(0,0,0);">; </span><span style="color:rgb(50,185,185);">color</span><span style="color:rgb(74,85,219);">(</span><span style="color:rgb(188,143,143);">"</span><span style="color:rgb(188,143,143);">grey70</span><span style="color:rgb(188,143,143);">"</span><span style="color:rgb(74,85,219);">)</span><span style="color:rgb(74,85,219);">]</span><span style="color:rgb(0,0,0);">;
<img src="cid:part1.D98151BC.80B7638B@free.fr" alt="">
</span></pre>
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