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Erratum: the sentence including equation (7) ought to say that P varies as rho^{1+1/n}, not as rho^n, in a polytrope of index n. <script> (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) })(window,document,'script','//www.google-analytics.com/analytics.js','ga'); ga('create', 'UA-37369750-3', 'harvard.edu'); ga('send', 'pageview'); </script> <!-- ADS_MIRROR: CFA --> </body></html> <!-- end2 -->