ding">Â¶</a></h1>
<p>The field centre (<em>FC</em>) is defined as the distance in cm from the centre of the detector to the centre of the field and is calculated as the half the difference between the distance from the profile centre to the <a class="reference internal" href="BSHelp11-2-4-2.html#d-right-infl"><span class="std std-ref">right</span></a> and <a class="reference internal" href="BSHelp11-2-4-1.html#d-left-infl"><span class="std std-ref">left</span></a> inflection points:</p>
<div class="math n