--- a/graphics.sty	Sun Sep 21 11:46:49 2014 +0100
+++ b/graphics.sty	Sun Sep 21 17:40:04 2014 +0100
@@ -3,6 +3,7 @@
 \usetikzlibrary{positioning}
 \usetikzlibrary{calc}
 \usepackage{graphicx} 
+\usepackage{pgfplots}
 
 \newenvironment{bubble}[1][]{%
 \begin{tikzpicture}%