diff --git a/figures/ZH_simulation/signal_to_noise_definition.pdf b/figures/ZH_simulation/signal_to_noise_definition.pdf
new file mode 100644
index 0000000..c634435
Binary files /dev/null and b/figures/ZH_simulation/signal_to_noise_definition.pdf differ
diff --git a/figures/beacon/time_res_vs_snr.pdf b/figures/beacon/time_res_vs_snr.pdf
index 8c5922c..e6ce8be 100644
Binary files a/figures/beacon/time_res_vs_snr.pdf and b/figures/beacon/time_res_vs_snr.pdf differ
diff --git a/presentations/2023-04-13_group_meeting/2023-04-13_CRHEP.tex b/presentations/2023-04-13_group_meeting/2023-04-13_CRHEP.tex
index 23fe1bc..5a84de1 100644
--- a/presentations/2023-04-13_group_meeting/2023-04-13_CRHEP.tex
+++ b/presentations/2023-04-13_group_meeting/2023-04-13_CRHEP.tex
@@ -250,7 +250,8 @@
 		\begin{column}{0.5\textwidth}
 			\begin{itemize}
 				\item (Single) Sine beacon:\\
-					$\sigma < 1\mathrm{ns}$ from $\mathrm{SNR} > 3$.
+					$\sigma < 1\mathrm{ns}$ from $\mathrm{SNR} > 3$\\
+					depends on beacon period.
 				\vspace{1cm}
 				\item Pulsed beacon:\\
 						(small) ongoing work\\
@@ -273,4 +274,10 @@
 		\includegraphics<+>[width=\textwidth]{radio_interferometry/dc_grid_power_time_fixes.py.X400.no_offset.scale4d.pdf}
 	\end{figure}
 \end{frame}
+
+\begin{frame}{Signal to Noise definition}
+	\begin{figure}
+		\includegraphics[width=\textwidth]{ZH_simulation/signal_to_noise_definition.pdf}
+	\end{figure}
+\end{frame}
 \end{document}