>scale</span> <span class="o">=</span> <span class="mf">1.30</span>
    <span class="n">y0</span> <span class="o">=</span> <span class="n">base</span> <span class="o">+</span> <span class="n">noise</span> <span class="o">/</span> <span class="mf">20.0</span>
    <span class="n">y1</span> <span class="o">=</span> <span class="n">scale</span> <span class="o">*</span> <span class="n">base</span> <span class="o">+</span> <span class="n">x</span> <span class="o">/</span> <span class="mf">400.0</span>

    <span 