Flexstylus grips

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diff --git a/tex/3-input.tex b/tex/3-input.tex
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+++ b/tex/3-input.tex
@@ -420,6 +420,18 @@ We used a minimal application for our measures, but real applications most likel
 FlexStylus \cite{fellion17}
 Hyperbrush \cite{guerrero21}
 
+\begin{figure}[htb]
+  \def\sp{5cm}
+  \tikzexternalenable
+  \begin{tikzpicture}
+    \node[node distance=\sp] (pengrip) at (0,0) {\includegraphics[height=4cm]{figures/flexstylus-pengrip}};
+    \node[right of=pengrip, node distance=\sp] (joystickgrip) {\includegraphics[height=4cm]{figures/flexstylus-joystickgrip}};
+    \node[right of=joystickgrip, node distance=\sp] (rollgrip) {\includegraphics[height=3cm]{figures/flexstylus-rollgrip}};
+  \end{tikzpicture}
+  \tikzexternaldisable
+  \label{fig:flexstylus}
+  \caption[Flexstylus]{Flexstylus}
+\end{figure}
 
 \subsection{Finger identification}
 \label{sec:fingeridentification}