Data recorded at different VLBI telescopes are brought to a central location and played back with careful synchronization. The data are correlated (combined) to perform <a href="https://en.wikipedia.org/wiki/aperture_synthesis" class="extiw" title="en:aperture synthesis">aperture synthesis</a>.
<a href="https://en.wikipedia.org/wiki/User:Rnt20" class="extiw" title="wikipedia:User:Rnt20">Bob Tubbs</a> at <a href="https://en.wikipedia.org/wiki/" class="extiw" title="wikipedia:">English Wikipedia</a>
<ul><li>Transferred from <span class="plainlinks"><a class="external text" href="https://en.wikipedia.org">en.wikipedia</a></span> to Commons.</li>
<li><span class="int-own-work" lang="en">Own work</span>. Drawing from my project at <a rel="nofollow" class="external autonumber" href="http://www.geocities.com/CapeCanaveral/2309/page3.html">[1]</a>.</li></ul>