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  3.  <b>Physical data with a precise number of significative digits.</b>
  4.  (name: <span class="tt">sigunits</span>)<br>
  5.  This is a text input to be compared with a given correct answer,
  6.  the syntax is &lt;number&gt; [&lt;physical unit&gt;]
  7.  [#&lt;desired number of significative digits&gt;]
  8. [,&lt;desired physical unit for the display&gt;]
  9.  <p>
  10.  example:
  11.  <ul>
  12.  <li><b>1m#3</b> means 1 meter with 3 significant digits. Synonyms:
  13.    <i>1.00m</i>, <i>0.00100 km</i>.</li>
  14.  <li><b>100.0 N</b> has the same meaning than <i>1e2N#3</i>: 100 newtons
  15.    with 3 significative numbers.</li>
  16.  <li><b>0.50A.h</b> would give "1.8e+02 C" when displaied. Use <b>0.50A.h</b>
  17.     to get "5.0e-01 A.h".
  18.  </ul>
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