deletions | additions       diff --git a/header.tex b/header.tex  index 4d74f3f..2484c38 100644  --- a/header.tex  +++ b/header.tex 
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\bibliographystyle{unsrt}  \setlength\parindent{0pt} \def\etal{{\it et al. }}  \def\apj{{\it Ap. J.}}  \def\apjlett{{\it Ap. J. (Letters)}}  \def\apjsup{{\it Ap. J. Supp.}}  \def\aanda{{\it Astron. and Astrophys.}}  \def\baas{{\it Bull. of the Amer. Astr. Soc.}}  \def\mnras{{\it M.N.R.A.S.}}  \def\araa{{\it Ann. Rev. Astron. Astrophys.}}  \def\aj{{\it A.J.}}