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      <header alignment="Center" color="#a9a9a9">&amp;[DATE] &amp;[TIME] - &amp;[FILENAME]</header>
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    <text lang="eng">
      <p bold="true">Plot Doublet Demo</p>
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        <e type="bracket">(</e>
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        <e type="operand">x</e>
        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operand">y</e>
        <e type="operand">2</e>
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        <e type="operand">0</e>
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        <e type="function" args="1">F</e>
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        <e type="operand">y</e>
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        <e type="operand">1</e>
        <e type="operator" args="2">:</e>
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        <e type="operand">R</e>
        <e type="operand">1</e>
        <e type="operator" args="2">:</e>
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        <e type="operand">0.25</e>
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        <e type="operand">R</e>
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        <e type="operator" args="2">^</e>
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        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operator" args="2">+</e>
        <e type="operator" args="2">/</e>
        <e type="operand">level</e>
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        <e type="operator" args="2">:</e>
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        <e type="function" preserve="true" args="1">Re</e>
        <e type="operand">0</e>
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        <e type="operand" style="string" />
        <e type="function" preserve="true" args="3">if</e>
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        <e type="operand">1</e>
        <e type="function" preserve="true" args="4">sys</e>
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        <e type="function" args="2">Doublet_3</e>
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        <e type="operand">R</e>
        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operator" args="1">-</e>
        <e type="operand">x</e>
        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operator" args="2">+</e>
        <e type="operand">y</e>
        <e type="operand">2</e>
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        <e type="operator" args="2">+</e>
        <e type="bracket">(</e>
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        <e type="operand">x</e>
        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operand">y</e>
        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operator" args="2">+</e>
        <e type="operator" args="2">/</e>
        <e type="operand">α</e>
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        <e type="operator" args="2">*</e>
        <e type="operator" args="2">+</e>
        <e type="operator" args="2">:</e>
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        <e type="operand">y</e>
        <e type="function" args="2">Doublet_4</e>
        <e type="operand">y</e>
        <e type="operand">R</e>
        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operator" args="1">-</e>
        <e type="operand">x</e>
        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operator" args="2">+</e>
        <e type="operand">y</e>
        <e type="operand">2</e>
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        <e type="operator" args="2">+</e>
        <e type="bracket">(</e>
        <e type="operator" args="2">*</e>
        <e type="operand">x</e>
        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operand">y</e>
        <e type="operand">2</e>
        <e type="operator" args="2">^</e>
        <e type="operator" args="2">+</e>
        <e type="operator" args="2">/</e>
        <e type="operand">α</e>
        <e type="operand">level</e>
        <e type="operator" args="2">*</e>
        <e type="operator" args="2">-</e>
        <e type="operator" args="2">:</e>
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    <text lang="eng">
      <p bold="true">Maxima X_Y plot is not compatible with contour(x) </p>
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        <e type="operand">1</e>
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        <e type="operand">2</e>
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        <e type="operand">Doublet_2</e>
        <e type="operand">Doublet_3</e>
        <e type="operand">Doublet_4</e>
        <e type="operand">5</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="7">sys</e>
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        <e type="operand">1</e>
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        <e type="function" preserve="true" args="1">Re</e>
        <e type="operand">x</e>
        <e type="function" args="1">F</e>
        <e type="operand">2</e>
        <e type="function" preserve="true" args="2">el</e>
        <e type="function" preserve="true" args="1">Re</e>
        <e type="operand">x</e>
        <e type="function" args="1">F</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="2">el</e>
        <e type="function" preserve="true" args="1">Im</e>
        <e type="operand">x</e>
        <e type="function" args="1">F</e>
        <e type="operand">2</e>
        <e type="function" preserve="true" args="2">el</e>
        <e type="function" preserve="true" args="1">Im</e>
        <e type="operand">4</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="6">sys</e>
      </input>
    </xyplot>
  </region>
  <region id="20" left="27" top="621" width="285" height="82" color="#000000" bgColor="#ffffe1" fontSize="10">
    <math decimalPlaces="3">
      <input>
        <e type="operand">u</e>
        <e type="function" args="1">contour</e>
        <e type="operand">r</e>
        <e type="operand">u</e>
        <e type="operand">i</e>
        <e type="operand">u</e>
        <e type="function" args="1">contour</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="2">el</e>
        <e type="operator" args="2">*</e>
        <e type="operator" args="2">+</e>
        <e type="function" preserve="true" args="1">arg</e>
        <e type="operand">3</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="5">mat</e>
      </input>
      <result action="numeric">
        <e type="operand">1.197</e>
        <e type="operand">1.197</e>
        <e type="operator" args="1">-</e>
        <e type="operand">2</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="4">sys</e>
        <e type="operand">1.731</e>
        <e type="operand">0.764</e>
        <e type="operand">3</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="5">mat</e>
      </result>
    </math>
  </region>
  <region id="21" left="27" top="711" width="240" height="158" color="#000000" bgColor="#ffffff" fontSize="10" showInputData="False">
    <plot type="2d" render="lines" scale_x="4.1354756877215" scale_y="4.05317972153584" scale_z="16.7618261963773" rotate_x="0" rotate_y="0" rotate_z="0" transpose_x="0" transpose_y="0" transpose_z="0">
      <input>
        <e type="operand">x</e>
        <e type="function" args="1">contour</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="2">el</e>
        <e type="operand">x</e>
        <e type="function" args="1">contour</e>
        <e type="operand">2</e>
        <e type="function" preserve="true" args="2">el</e>
        <e type="operand">u</e>
        <e type="operand">u</e>
        <e type="function" args="1">contour</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="2">el</e>
        <e type="operand" style="string">+</e>
        <e type="operand">14</e>
        <e type="operand" style="string">black</e>
        <e type="operand">1</e>
        <e type="operand">5</e>
        <e type="function" preserve="true" args="7">mat</e>
        <e type="operand">0</e>
        <e type="operand">0</e>
        <e type="operand">u</e>
        <e type="operand">u</e>
        <e type="function" args="1">contour</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="2">el</e>
        <e type="operand">0</e>
        <e type="operand">0</e>
        <e type="operand">3</e>
        <e type="operand">2</e>
        <e type="function" preserve="true" args="8">mat</e>
        <e type="operand">4</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="6">sys</e>
      </input>
    </plot>
  </region>
  <region id="22" left="342" top="783" width="322" height="88" border="true" color="#000000" bgColor="#ffffe1" fontSize="10">
    <text lang="eng">
      <p>3D plot region is short of essentials:=&gt; is not a 3D: rather a 2D parametric1. NO user mesh density adjustable2. NO mesh unicolor &amp; user color3. Does NOT save settings !!!</p>
    </text>
  </region>
</regions>