ity-icru-72" title="Link to this heading">Â¶</a></h1>
<p>Returns the maximum difference between the max and the min of the <a class="reference internal" href="BSHelp9-2.html#in-field-area"><span class="std std-ref">In Field Area</span></a> normalised to the average of the IFA according to ICRU 72 eq 3.2.</p>
<div class="math notranslate nohighlight">
\[{(max-min)} \cdot \cfrac {100} {ave}\]</div>
<p>Where <em>max</em> and <em>min</em> are the IFA maximum and minimum respectively and <em>ave</em> is the av