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        <e type="operand">Y</e>
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        <e type="operand">plot</e>
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        <e type="operand">X</e>
        <e type="operand">1</e>
        <e type="operand">X</e>
        <e type="operand">0</e>
        <e type="operand">2</e>
        <e type="operand">2</e>
        <e type="function" preserve="true" args="6">mat</e>
        <e type="operand">6</e>
        <e type="operand">1</e>
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      <p>===========================================================</p>
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        <e type="operand">ε</e>
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        <e type="operand">x</e>
        <e type="operand">0</e>
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        <e type="operand">ωc</e>
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        <e type="operand">x</e>
        <e type="function" args="1">H</e>
        <e type="operand">1</e>
        <e type="operand">1</e>
        <e type="operand">ε</e>
        <e type="operand">n</e>
        <e type="operand">x</e>
        <e type="operand">ωc</e>
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      <p>=========================================================</p>
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        <e type="operand">u</e>
        <e type="operand">0</e>
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        <e type="operand">x</e>
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        <e type="operand">i</e>
        <e type="operand">x</e>
        <e type="operator" args="2">*</e>
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        <e type="function" preserve="true" args="1">abs</e>
        <e type="operand">2</e>
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        <e type="operand">2</e>
        <e type="operator" args="2">/</e>
        <e type="operand">0.929</e>
        <e type="operand">1</e>
        <e type="operand">0.929</e>
        <e type="operand">0</e>
        <e type="operand">2</e>
        <e type="operand">2</e>
        <e type="function" preserve="true" args="6">mat</e>
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    <text lang="eng">
      <p>=====================================================</p>
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      <title lang="eng">
        <p>     pts(data,spec)</p>
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          <e type="operand">data</e>
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          <e type="operand" style="string">Unest 'p' </e>
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          <e type="operand">v</e>
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          <e type="operand">data</e>
          <e type="operand">v</e>
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          <e type="operand">5</e>
          <e type="operand">1</e>
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          <e type="function" args="5">plotG</e>
          <e type="operand">a</e>
          <e type="operand" style="string">char</e>
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          <e type="operand">size</e>
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          <e type="operand">c</e>
          <e type="operand" style="string">color</e>
          <e type="operator" args="2">≡</e>
          <e type="operand">1</e>
          <e type="operand">3</e>
          <e type="function" preserve="true" args="5">mat</e>
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          <e type="operand">vx</e>
          <e type="function" preserve="true" args="1">length</e>
          <e type="operator" args="2">:</e>
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          <e type="operand">vy</e>
          <e type="operand">1</e>
          <e type="function" preserve="true" args="2">el</e>
          <e type="operand">a</e>
          <e type="operand">b</e>
          <e type="operand">c</e>
          <e type="function" preserve="true" args="5">augment</e>
          <e type="operator" args="2">:</e>
          <e type="operand">i</e>
          <e type="operand">2</e>
          <e type="operand">n</e>
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          <e type="operand">i</e>
          <e type="function" preserve="true" args="2">el</e>
          <e type="operand">vy</e>
          <e type="operand">i</e>
          <e type="function" preserve="true" args="2">el</e>
          <e type="operand">a</e>
          <e type="operand">b</e>
          <e type="operand">c</e>
          <e type="function" preserve="true" args="5">augment</e>
          <e type="function" preserve="true" args="2">stack</e>
          <e type="operator" args="2">:</e>
          <e type="function" preserve="true" args="3">for</e>
          <e type="operand">plot</e>
          <e type="operand">5</e>
          <e type="operand">1</e>
          <e type="function" preserve="true" args="7">line</e>
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      <area terminator="true" />
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  </region>
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    <math optimize="2" fractionType="auto" decimalPlaces="6">
      <description active="true" position="Top" lang="eng">
        <p>Fourier "ifft" from padded created vector [Numeric]</p>
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        <e type="operand">v</e>
        <e type="function" args="1">ifft</e>
        <e type="operand">N</e>
        <e type="operand">v</e>
        <e type="function" preserve="true" args="1">length</e>
        <e type="operator" args="2">:</e>
        <e type="operand">s</e>
        <e type="operand">1</e>
        <e type="operand">N</e>
        <e type="function" preserve="true" args="1">sqrt</e>
        <e type="operator" args="2">/</e>
        <e type="operator" args="2">:</e>
        <e type="operand">1</e>
        <e type="operand">2</e>
        <e type="function" preserve="true" args="4">mat</e>
        <e type="operand">n</e>
        <e type="operand">0</e>
        <e type="operand">N</e>
        <e type="function" preserve="true" args="2">range</e>
        <e type="operand">I</e>
        <e type="operand">n</e>
        <e type="operand">1</e>
        <e type="operator" args="2">+</e>
        <e type="function" preserve="true" args="2">el</e>
        <e type="operand">s</e>
        <e type="bracket">(</e>
        <e type="operand">v</e>
        <e type="operand">k</e>
        <e type="operand">1</e>
        <e type="operator" args="2">+</e>
        <e type="function" preserve="true" args="2">el</e>
        <e type="operand">e</e>
        <e type="operand">i</e>
        <e type="operand">2</e>
        <e type="operand">π</e>
        <e type="operator" args="2">*</e>
        <e type="operand">n</e>
        <e type="operator" args="2">*</e>
        <e type="operand">N</e>
        <e type="operator" args="2">/</e>
        <e type="bracket">(</e>
        <e type="operator" args="2">*</e>
        <e type="operand">k</e>
        <e type="operator" args="2">*</e>
        <e type="operator" args="1">-</e>
        <e type="operator" args="2">^</e>
        <e type="operator" args="2">*</e>
        <e type="bracket">(</e>
        <e type="operand">k</e>
        <e type="operand">0</e>
        <e type="operand">N</e>
        <e type="operand">1</e>
        <e type="operator" args="2">-</e>
        <e type="function" preserve="true" args="4">sum</e>
        <e type="function" preserve="true" args="1">eval</e>
        <e type="operator" args="2">*</e>
        <e type="operator" args="2">:</e>
        <e type="function" preserve="true" args="3">for</e>
        <e type="operand">I</e>
        <e type="operand">3</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="5">line</e>
        <e type="operator" args="2">:</e>
      </input>
    </math>
  </region>
  <region id="25" left="486" top="1647" width="264" height="122" border="true" color="#000000" bgColor="#ebebeb" fontSize="10">
    <math>
      <description active="true" position="Top" lang="eng">
        <p>'N' pts in range [L, H]</p>
      </description>
      <input>
        <e type="operand">L</e>
        <e type="operand">H</e>
        <e type="operand">N</e>
        <e type="function" args="3">xd</e>
        <e type="operand">U</e>
        <e type="operand">0</e>
        <e type="operator" args="2">:</e>
        <e type="operand">dx</e>
        <e type="operand">H</e>
        <e type="operand">L</e>
        <e type="operator" args="2">-</e>
        <e type="operand">N</e>
        <e type="operator" args="2">/</e>
        <e type="operator" args="2">:</e>
        <e type="operand">i</e>
        <e type="operand">1</e>
        <e type="operand">N</e>
        <e type="function" preserve="true" args="2">range</e>
        <e type="operand">U</e>
        <e type="operand">i</e>
        <e type="function" preserve="true" args="2">el</e>
        <e type="operand">L</e>
        <e type="operand">dx</e>
        <e type="operator" args="2">-</e>
        <e type="bracket">(</e>
        <e type="operand">dx</e>
        <e type="operand">i</e>
        <e type="operator" args="2">*</e>
        <e type="operator" args="2">+</e>
        <e type="operator" args="2">:</e>
        <e type="function" preserve="true" args="3">for</e>
        <e type="operand">U</e>
        <e type="operand">4</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="6">line</e>
        <e type="operator" args="2">:</e>
      </input>
    </math>
  </region>
  <region id="26" left="45" top="1818" width="215" height="49" color="#000000" bgColor="#ffffff" fontSize="10">
    <math>
      <input>
        <e type="operand">α</e>
        <e type="operand">20</e>
        <e type="operator" args="2">:</e>
        <e type="bracket">(</e>
        <e type="operand" style="string">set the span</e>
        <e type="operator" args="2">≡</e>
        <e type="operand">β</e>
        <e type="operand">17</e>
        <e type="operator" args="2">:</e>
        <e type="bracket">(</e>
        <e type="operand" style="string">ellipse oblate</e>
        <e type="operator" args="2">≡</e>
        <e type="operand">2</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="4">line</e>
      </input>
    </math>
  </region>
  <region id="27" left="324" top="1818" width="130" height="44" color="#000000" bgColor="#ffffff" fontSize="10">
    <math>
      <input>
        <e type="operand">3</e>
        <e type="operand">α</e>
        <e type="operator" args="2">/</e>
        <e type="operand">12</e>
        <e type="operand">α</e>
        <e type="operator" args="2">/</e>
        <e type="operand">β</e>
        <e type="operand">α</e>
        <e type="operator" args="2">/</e>
        <e type="operand">12</e>
        <e type="operand">α</e>
        <e type="operator" args="2">/</e>
        <e type="operand">3</e>
        <e type="operand">α</e>
        <e type="operator" args="2">/</e>
        <e type="operand">1</e>
        <e type="operand">5</e>
        <e type="function" preserve="true" args="7">mat</e>
      </input>
    </math>
  </region>
  <region id="28" left="621" top="1872" width="94" height="27" color="#000000" bgColor="#ffffff" fontSize="10">
    <math>
      <description active="true" position="Top" lang="eng">
        <p>smooth notch</p>
      </description>
      <input>
        <e type="operand">1</e>
        <e type="operand">4</e>
        <e type="operand">6</e>
        <e type="operand">4</e>
        <e type="operand">1</e>
        <e type="operand">1</e>
        <e type="operand">5</e>
        <e type="function" preserve="true" args="7">mat</e>
      </input>
    </math>
  </region>
  <region id="29" left="45" top="1881" width="154" height="36" color="#000000" bgColor="#ffffff" fontSize="10">
    <math fractionType="auto" decimalPlaces="6">
      <input>
        <e type="operand">Filter</e>
        <e type="operand">1</e>
        <e type="operand">2</e>
        <e type="operand">0</e>
        <e type="operand">4</e>
        <e type="operand">1</e>
        <e type="operand">4</e>
        <e type="function" preserve="true" args="6">mat</e>
        <e type="function" preserve="true" args="1">transpose</e>
        <e type="operator" args="2">:</e>
      </input>
    </math>
  </region>
  <region id="30" left="360" top="1890" width="138" height="44" color="#000000" bgColor="#ffffff" fontSize="10">
    <math>
      <input>
        <e type="operand">3</e>
        <e type="operand">α</e>
        <e type="operator" args="2">/</e>
        <e type="operand">12</e>
        <e type="operand">α</e>
        <e type="operator" args="2">/</e>
        <e type="operand">17</e>
        <e type="operand">α</e>
        <e type="operator" args="2">/</e>
        <e type="operand">12</e>
        <e type="operand">α</e>
        <e type="operator" args="2">/</e>
        <e type="operand">3</e>
        <e type="operand">α</e>
        <e type="operator" args="2">/</e>
        <e type="operand">1</e>
        <e type="operand">5</e>
        <e type="function" preserve="true" args="7">mat</e>
      </input>
    </math>
  </region>
  <region id="31" left="531" top="1899" width="78" height="27" color="#000000" bgColor="#ffffff" fontSize="10">
    <math>
      <input>
        <e type="operand">1</e>
        <e type="operand">2</e>
        <e type="operand">0</e>
        <e type="operand">4</e>
        <e type="operand">1</e>
        <e type="operand">4</e>
        <e type="function" preserve="true" args="6">mat</e>
      </input>
    </math>
  </region>
  <region id="32" left="45" top="1944" width="51" height="24" color="#000000" bgColor="#ffffff" fontSize="10">
    <math fractionType="auto" decimalPlaces="6">
      <input>
        <e type="operand">N</e>
        <e type="operand">65</e>
        <e type="operator" args="2">:</e>
      </input>
    </math>
  </region>
  <region id="33" top="1980" color="#000000" bgColor="#ffffff">
    <area collapsed="true" />
    <region id="34" left="36" top="2007" width="264" height="24" color="#000000" bgColor="#ffffff" fontSize="10">
      <math decimalPlaces="6">
        <input>
          <e type="operand">N</e>
          <e type="operand" style="string">sets the span of the Dirac</e>
          <e type="operator" args="2">≡</e>
        </input>
      </math>
    </region>
    <region id="35" left="36" top="2043" width="244" height="127" border="true" color="#000000" bgColor="#ffffff" fontSize="10">
      <math fractionType="auto" decimalPlaces="6">
        <input>
          <e type="operand">Dirac</e>
          <e type="operand">n</e>
          <e type="operand">1</e>
          <e type="operand">N</e>
          <e type="function" preserve="true" args="2">range</e>
          <e type="operand">n</e>
          <e type="operand">Filter</e>
          <e type="function" preserve="true" args="1">rows</e>
          <e type="operator" args="2">≤</e>
          <e type="operand">Dirac</e>
          <e type="operand">n</e>
          <e type="function" preserve="true" args="2">el</e>
          <e type="operand">Filter</e>
          <e type="operand">n</e>
          <e type="function" preserve="true" args="2">el</e>
          <e type="operator" args="2">:</e>
          <e type="operand">Dirac</e>
          <e type="operand">n</e>
          <e type="function" preserve="true" args="2">el</e>
          <e type="operand">0</e>
          <e type="operator" args="2">:</e>
          <e type="function" preserve="true" args="3">if</e>
          <e type="function" preserve="true" args="3">for</e>
          <e type="operand">Dirac</e>
          <e type="operand">2</e>
          <e type="operand">1</e>
          <e type="function" preserve="true" args="4">line</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region id="36" left="351" top="2043" width="121" height="26" color="#000000" bgColor="#ffff80" fontSize="10">
      <math decimalPlaces="6">
        <input>
          <e type="operand">V</e>
          <e type="operand">Dirac</e>
          <e type="function" args="1">ifft</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region id="37" left="351" top="2079" width="138" height="85" border="true" color="#000000" bgColor="#ffffff" fontSize="10">
      <math decimalPlaces="6">
        <input>
          <e type="operand">NN</e>
          <e type="operand">V</e>
          <e type="function" preserve="true" args="1">length</e>
          <e type="operator" args="2">:</e>
          <e type="operand">L</e>
          <e type="operand">0</e>
          <e type="operator" args="2">:</e>
          <e type="operand">H</e>
          <e type="operand">π</e>
          <e type="operator" args="2">:</e>
          <e type="operand">U</e>
          <e type="operand">L</e>
          <e type="operand">H</e>
          <e type="operand">NN</e>
          <e type="function" args="3">xd</e>
          <e type="operator" args="2">:</e>
          <e type="operand">4</e>
          <e type="operand">1</e>
          <e type="function" preserve="true" args="6">line</e>
        </input>
      </math>
    </region>
    <region id="38" left="504" top="2079" width="223" height="71" border="true" color="#000000" bgColor="#ffffff" fontSize="10">
      <math optimize="2" fractionType="auto" decimalPlaces="6">
        <description active="true" position="Top" lang="eng">
          <p>Vectorise on length 'V' </p>
        </description>
        <input>
          <e type="operand">F</e>
          <e type="operand">t</e>
          <e type="operand">U</e>
          <e type="operator" args="2">:</e>
          <e type="operand">Ω</e>
          <e type="operand">V</e>
          <e type="function" preserve="true" args="1">mat2sys</e>
          <e type="function" preserve="true" args="1">abs</e>
          <e type="function" preserve="true" args="1">sys2mat</e>
          <e type="operator" args="2">:</e>
          <e type="operand">t</e>
          <e type="operand">Ω</e>
          <e type="function" preserve="true" args="2">augment</e>
          <e type="operand">3</e>
          <e type="operand">1</e>
          <e type="function" preserve="true" args="5">line</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region id="39" left="351" top="2169" width="122" height="26" color="#000000" bgColor="#ebebeb" fontSize="10">
      <math decimalPlaces="6">
        <input>
          <e type="operand">V</e>
          <e type="function" preserve="true" args="1">length</e>
        </input>
        <result action="numeric">
          <e type="operand">66</e>
        </result>
      </math>
    </region>
    <region id="40" left="36" top="2187" width="253" height="27" color="#000000" bgColor="#fff5ff" fontSize="10">
      <math fractionType="fraction" decimalPlaces="6">
        <input>
          <e type="operand">a</e>
          <e type="operand">b</e>
          <e type="operand">c</e>
          <e type="function" args="3">spec</e>
          <e type="operand" style="string">.</e>
          <e type="operand">10</e>
          <e type="operand" style="string">black</e>
          <e type="operand">1</e>
          <e type="operand">3</e>
          <e type="function" preserve="true" args="5">mat</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region id="41" left="504" top="2187" width="199" height="49" color="#000000" bgColor="#ffffff" fontSize="10">
      <math decimalPlaces="6">
        <input>
          <e type="operand">scale</e>
          <e type="operand">1</e>
          <e type="operand">F</e>
          <e type="operand">1</e>
          <e type="operand">2</e>
          <e type="function" preserve="true" args="3">el</e>
          <e type="operator" args="2">/</e>
          <e type="operator" args="2">:</e>
        </input>
        <result action="numeric">
          <e type="operand">1.151751</e>
        </result>
      </math>
    </region>
    <region id="42" left="36" top="2214" width="262" height="28" color="#000000" bgColor="#fff5ff" fontSize="10">
      <math fractionType="fraction" decimalPlaces="6">
        <input>
          <e type="operand">pts</e>
          <e type="operand">scale</e>
          <e type="operand">F</e>
          <e type="operator" args="2">*</e>
          <e type="operand">a</e>
          <e type="operand">b</e>
          <e type="operand">c</e>
          <e type="function" args="3">spec</e>
          <e type="function" args="2">pts</e>
          <e type="operator" args="2">:</e>
        </input>
      </math>
    </region>
    <region id="43" top="2241" color="#000000" bgColor="#ffffff">
      <area terminator="true" />
    </region>
  </region>
  <region id="44" left="423" top="2277" width="160" height="26" color="#000000" bgColor="#ffffff" fontSize="10">
    <math decimalPlaces="6">
      <input>
        <e type="operand">vy</e>
        <e type="operand">scale</e>
        <e type="operand">F</e>
        <e type="operator" args="2">*</e>
        <e type="operand">2</e>
        <e type="function" preserve="true" args="2">col</e>
        <e type="operator" args="2">:</e>
      </input>
    </math>
  </region>
  <region id="45" left="612" top="2277" width="114" height="26" color="#000000" bgColor="#ffffff" fontSize="10">
    <math>
      <input>
        <e type="operand">vy</e>
        <e type="function" preserve="true" args="1">rows</e>
      </input>
      <result action="numeric">
        <e type="operand">66</e>
      </result>
    </math>
  </region>
  <region id="46" left="45" top="2295" width="341" height="158" color="#000000" bgColor="#ebebeb" fontSize="10">
    <plot type="2d" render="lines" scale_x="7.21541655725945" scale_y="1.86035749647397" scale_z="13.42325428248" rotate_x="0" rotate_y="0" rotate_z="0" transpose_x="-121" transpose_y="-45" transpose_z="0">
      <description active="true" position="Top" lang="eng">
        <p>Smath style [Fourier-Dirac Discrete Filter]</p>
      </description>
      <input>
        <e type="operand">pts</e>
        <e type="operand">scale</e>
        <e type="operand">F</e>
        <e type="operator" args="2">*</e>
        <e type="operand">2</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="4">sys</e>
      </input>
    </plot>
  </region>
  <region id="47" left="423" top="2313" width="156" height="26" color="#000000" bgColor="#ffffff" fontSize="10">
    <math decimalPlaces="6">
      <input>
        <e type="operand">vy</e>
        <e type="function" preserve="true" args="1">Min</e>
      </input>
      <result action="numeric">
        <e type="operand">0.225689</e>
      </result>
    </math>
  </region>
  <region id="48" left="423" top="2340" width="288" height="137" border="true" color="#000000" bgColor="#ffffff" fontSize="10">
    <math fractionType="fraction">
      <input>
        <e type="operand">v</e>
        <e type="operand">tresh</e>
        <e type="function" args="2">first</e>
        <e type="operand">j</e>
        <e type="operand">N</e>
        <e type="operand">2</e>
        <e type="operator" args="2">/</e>
        <e type="function" preserve="true" args="1">Ceil</e>
        <e type="operator" args="2">:</e>
        <e type="operand">v</e>
        <e type="operand">j</e>
        <e type="function" preserve="true" args="2">el</e>
        <e type="function" preserve="true" args="1">abs</e>
        <e type="operand">tresh</e>
        <e type="operator" args="2">≥</e>
        <e type="operand">j</e>
        <e type="operand">j</e>
        <e type="operand">1</e>
        <e type="operator" args="2">+</e>
        <e type="operator" args="2">:</e>
        <e type="function" preserve="true" args="2">while</e>
        <e type="operand">j</e>
        <e type="operand">v</e>
        <e type="operand">j</e>
        <e type="function" preserve="true" args="2">el</e>
        <e type="operand">2</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="4">mat</e>
        <e type="operand">3</e>
        <e type="operand">1</e>
        <e type="function" preserve="true" args="5">line</e>
        <e type="operator" args="2">:</e>
      </input>
    </math>
  </region>
  <region id="49" left="423" top="2475" width="155" height="26" color="#000000" bgColor="#ffffff" fontSize="10">
    <math error="88" decimalPlaces="6">
      <input>
        <e type="operand">vy</e>
        <e type="operand">0.1</e>
        <e type="function" args="2">first</e>
      </input>
      <result action="numeric">
        <e type="operand">#</e>
      </result>
    </math>
  </region>
</regions>