Beam pattern.
<a href="https://en.wikipedia.org/wiki/User:Mvannier" class="extiw" title="wikipedia:User:Mvannier">Mvannier</a> at <a href="https://en.wikipedia.org/wiki/" class="extiw" title="wikipedia:">English Wikipedia</a>
according to <a href="https://en.wikipedia.org/wiki/Exchangeable_image_file_format" class="extiw" title="en:Exchangeable image file format">Exif</a> data
Figure 1 in S.G. Zabetakis, J.F. Peterson. THE DIYARBAKIR RADAR - Tour through one type of spaceflight tracking system. Central Intelligence Agency document APPROVED FOR RELEASE 1994; CIA HISTORICAL REVIEW PROGRAM 2 JULY 96. Center for the Study of Intelligence, Posted: 2007-05-08. <a rel="nofollow" class="external autonumber" href="https://www.cia.gov/library/center-for-the-study-of-intelligence/index.html">[1]</a>