diff -r bc54c5e648d7 -r eb589fa73fc1 Paper/document/root.tex
--- a/Paper/document/root.tex	Thu Jan 24 18:59:49 2013 +0100
+++ b/Paper/document/root.tex	Fri Jan 25 15:57:58 2013 +0100
@@ -10,6 +10,7 @@
 \usepackage{pdfsetup}
 \usepackage{tikz}
 \usepackage{pgf}
+\usepackage{color}
 
 %% for testing
 \usepackage{endnotes}
@@ -19,6 +20,9 @@
 \urlstyle{rm}
 \isabellestyle{it}
 
+% gray boxes
+\definecolor{mygrey}{rgb}{.80,.80,.80}
+
 % mathpatir
 \mprset{sep=0.8em}
 \mprset{center=false}