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<p>Finds the area-average of a scalar. </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">self</td><td>Target field object </td></tr>
    <tr><td class="paramname">aParticles</td><td><a class="el" href="structparticlesmodule_1_1particles.html" title="Class used to define a spatial discretization that may move in ph