A barnstar for you    stylebackgroundcolor fdffe border px solid fceb rowspan styleverticalalign middle padding px   stylefontsize xlarge padding px px  px height em  The Original Barnstar  styleverticalalign middle padding px  The best reference is a paper C J Burrows et al Apj   Figure  shows the limb brightening  taking no account of the superradiance The superradiance has the well known property to leave only an orthogonal set of the the strongest modes light beams  jmo