Scaled tikz circuit figure.

prob-def.tex

@@ -21,7 +21,9 @@ The circuits $\inparen{1}$ and $\inparen{2}$ in column $\poly$ of \Cref{fig:two-
 
 	\begin{figure}[t!]
 		\centering
-		\begin{tikzpicture}[thick]
+		%see https://tex.stackexchange.com/questions/26846/how-to-scale-a-tikzpicture-including-texts#26852
+		%for a nice explanation of scaling a tikzpicture
+		\begin{tikzpicture}[thick, scale=0.67, every node/.style={transform shape}]
 			\node[tree_node] (a1) at (0, 0) {$\boldsymbol{X}$};
 			\node[tree_node] (b1) at (1.5, 0) {$\boldsymbol{2}$};
 			\node[tree_node] (c1) at (3, 0) {$\boldsymbol{Y}$};