diff --git a/article.Rtex b/article.Rtex
index b847c08..2793fb6 100644
--- a/article.Rtex
+++ b/article.Rtex
@@ -580,7 +580,7 @@ When the amount of human-labled data is low, inaccuracies in the 95\% confidence
 \begin{figure}
 <<example.4.z, echo=FALSE, message=FALSE, warning=FALSE, result='asis', dev='pdf', fig.width=6, fig.asp=.65,cache=F>>=
 
-p <- plot.simulation.dv(plot.df.example.4,'x')
+p <- plot.simulation.dv(plot.df.example.4,'z')
 grid.draw(p)
 @
 \caption{Simulation 2b: Systematic misclassification of a dependent variable. Only the MLA approach obtains consistent estimates. \label{fig:sim2b.x}}