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      <author>Alvaro Diaz Falconi</author>
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      <header alignment="Center" color="#a9a9a9">&amp;[DATE] &amp;[TIME] - &amp;[FILENAME]</header>
      <footer alignment="Center" color="#a9a9a9">&amp;[PAGENUM] / &amp;[COUNT]</footer>
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            <p>Refraction index</p>
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          <e type="operand">1.5</e>
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          <e type="operand">Plot</e>
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          <e type="operand">1</e>
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    <region left="18" top="36" width="95" height="24" color="#000000" fontSize="10">
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            <p>Lens radius</p>
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          <e type="operand">d</e>
          <e type="operand">60</e>
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            <p>Rays</p>
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          <e type="operand">k</e>
          <e type="operand">0</e>
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          <e type="operand">x.0</e>
          <e type="operand">100</e>
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            <p>from -∞</p>
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          <e type="operand">φ.i</e>
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          <e type="operand">r</e>
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          <e type="operand">φ.e</e>
          <e type="operand">n</e>
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          <e type="operand">1</e>
          <e type="operand">2</e>
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          <e type="operand">y.2</e>
          <e type="operand">1</e>
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          <e type="operand">2</e>
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