deletions | additions       diff --git a/header.tex b/header.tex  index 00b3e57..171fa24 100644  --- a/header.tex  +++ b/header.tex 
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%%  \documentclass[aps,prl,twocolumn,groupedaddress,showpacs,letterpaper,floatfix,10pt]{revtex4-1} %%  \usepackage{amsmath,amssymb,graphicx,hyperref} %%  \hypersetup{pdfnewwindow=true, colorlinks=true, linkcolor=blue, anchorcolor=blue, %%  citecolor=blue, filecolor=blue, menucolor=blue, urlcolor=blue} \def\k{{\bf k}}