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    <h2 id="src">Source Code</h2>
    <div class="hl codehilite"><pre><span></span><span class="w">     </span><span class="k">program </span><span class="n">demo_plot</span>
<span class="w">     </span><span class="k">use </span><span class="n">M_datapac</span><span class="p">,</span><span class="w"> </span><span class="k">only</span><span class="w"> </span><span class="p">:</span><span class="w"> </span><span class="n">plot</span>
<span class="w">     </span><sp