Simplified principle of operation of a HURA hexagonal coded aperture mask used in the SPI instrument of the INTEGRAL space telescope by CMG Lee, based on data at <a rel="nofollow" class="external free" href="http://ipl.uv.es/?q=content/page/spi-coded-mask">http://ipl.uv.es/?q=content/page/spi-coded-mask</a> and <a rel="nofollow" class="external free" href="http://nature.com/nature/journal/v428/n6980/fig_tab/428264a_F1.html">http://nature.com/nature/journal/v428/n6980/fig_tab/428264a_F1.html</a> .
<a href="//commons.wikimedia.org/wiki/User:Cmglee" title="User:Cmglee">Cmglee</a>
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