diff --git a/letter.tex b/letter.tex
index e77fb5c..8d52ef2 100644
--- a/letter.tex
+++ b/letter.tex
@@ -27,6 +27,10 @@
 \hyphenation{op-tical net-works semi-conduc-tor IEEE-Xplore}
 
 
+\newif\ifoverleaf
+%\overleaftrue
+
+
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 % Inputs & Global Options
@@ -34,10 +38,20 @@
 %
 
 
-\input{common.tex}
+\ifoverleaf
+	\input{common.tex}
+\else
+	\usetikzlibrary{external}
+	\tikzexternalize[prefix=build/]
+	\input{lib/latex-common/common.tex}
+\fi
+
 
 \pgfplotsset{colorscheme/cel}
 
+% TODO
+\pgfplotsset{fancy marks/.style={}}
+
 
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%