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diff --git a/chapters/3_rewriting.tex b/chapters/3_rewriting.tex
index 950feb8..0ce0326 100644
--- a/chapters/3_rewriting.tex
+++ b/chapters/3_rewriting.tex
@@ -1119,17 +1119,17 @@ unoptimised prototype to a mature piece of software.
   \centering
   \begin{subfigure}[b]{.48\columnwidth}
     \centering
-    \includegraphics[width=\columnwidth]{assets/img/4_compare_runtime}
-    \caption{\label{sfig:4-compareruntime}Flattening run time (ms)}
+    \includegraphics[width=\columnwidth]{assets/img/rew_compare_runtime}
+    \caption{\label{sfig:4-compareruntime}Average run time (ms)}
   \end{subfigure}%
   \hspace{0.04\columnwidth}%
   \begin{subfigure}[b]{.48\columnwidth}
     \centering
-    \includegraphics[width=\columnwidth]{assets/img/4_compare_memory}
-    \caption{\label{sfig:4-comparemem}Flattening memory (MB)}
+    \includegraphics[width=\columnwidth]{assets/img/rew_compare_memory}
+    \caption{\label{sfig:4-comparemem}Maximum resident set size (kbytes)}
   \end{subfigure}
-  \caption{\label{fig:4-runtime}Performance on flattening 100 MiniZinc Challenge
-    instances. \minizinc\ 2.4.3 (x-axis) vs new architecture (y-axis), log-log
+  \caption{\label{fig:4-runtime}Performance on flattening MiniZinc Challenge
+    instances. \minizinc\ 2.5.5 (x-axis) vs new architecture (y-axis), log-log
     plot. Dots below the line indicate the new system is better.}
 \end{figure}