diff --git a/5432.tex b/5432.tex
index cd7411f..9222326 100644
--- a/5432.tex
+++ b/5432.tex
@@ -14,7 +14,7 @@
 \usepackage[english]{isodate}
 
 \usepackage{graphicx}
-\usepackage{subfigure}
+\usepackage{subfig}
 
 \usepackage{tikz}
 \usepackage{pgfplots}
@@ -195,16 +195,17 @@ Output noise are measured after 15 cm IDC cable, IDC-SMA, 100 cm coax ($\sim$50
 
 \newpage
 
-\begin{figure}[h]
-    \centering
-    \includegraphics[width=3.3in]{zotino_step_response_rising.png}
-    \caption{Step response (switching from -10V to +10V)}
-\end{figure}
+Step response are found by setting the DAC register to 0x0000 (-10V) or 0xFFFF (10V) and observe the waveform.
 
-\begin{figure}[h]
+\begin{figure}[hbt!]
     \centering
-    \includegraphics[width=3.3in]{zotino_step_response_falling.png}
-    \caption{Step response (switching from +10V to -10V)}
+    \subfloat[\centering Switching from -10V to +10V]{{
+        \includegraphics[height=1.8in]{zotino_step_response_rising.png}
+    }}%
+    \subfloat[\centering Switching from +10V to -10V]{{
+        \includegraphics[height=1.8in]{zotino_step_response_falling.png}
+    }}%
+    \caption{Step response}%
 \end{figure}
 
 Far-end crosstalk is measured using the following setup.