--- a/pnas/preamble.tex	Mon Oct 25 13:36:12 2010 -0700
+++ b/pnas/preamble.tex	Mon Oct 25 14:01:33 2010 -0700
@@ -37,7 +37,7 @@
 \newcommand{\tensor}{\otimes}
 \newcommand{\Tensor}{\bigotimes}
 
-\newcommand{\selfarrow}{\ensuremath{\smash{\tikz[baseline]{\clip (0,0.36) rectangle (0.48,-0.16); \draw[->] (0,0.2) .. controls (0.6,0.8) and (0.6,-0.6) .. (0,0);}}}}
+\newcommand{\selfarrow}{\ensuremath{\smash{\tikz[baseline]{\clip (0,0.36) rectangle (0.39,-0.16); \draw[->] (0,0.2) .. controls (0.5,0.6) and (0.5,-0.4) .. (0,0);}}}}
 
 \newcommand{\bdy}{\partial}
 \newcommand{\compose}{\circ}