can anyone tell me how the figured out where the black holes are?<p>with just 2 &quot;ears&quot; I&#x27;d expect to be only able to determen a circle, but here is the picture they released: <a href="http:&#x2F;&#x2F;content.screencast.com&#x2F;users&#x2F;cougarten&#x2F;folders&#x2F;Jing&#x2F;media&#x2F;64d98a70-7b90-45b6-ac97-2518aa657171&#x2F;2016-02-11_1650.png" rel="nofollow">http:&#x2F;&#x2F;content.screencast.com&#x2F;users&#x2F;cougarten&#x2F;folders&#x2F;Jing&#x2F;m...</a><p>Do i see a warped circle, or the bottom part of one? In the latter case I wonder how they found out.<p>Are the L-shape sensors capable of seeing some direction depending on which way the phases shift first&#x2F;last?<p>If you&#x27;d build one of the sensors in reverse you&#x27;d see a reversed signal, no? Given that they will have optimized the orientations of both stations this is probably how it worked and I&#x27;m seeing just part of a circle, right? That one lonely blob might be an unlikely mirrored version.