diff --git a/presentations/2023-06-01_step_up_interview/2023-STEP_UP.tex b/presentations/2023-06-01_step_up_interview/2023-STEP_UP.tex
index dc610f8..4b7c6c9 100644
--- a/presentations/2023-06-01_step_up_interview/2023-STEP_UP.tex
+++ b/presentations/2023-06-01_step_up_interview/2023-STEP_UP.tex
@@ -21,7 +21,25 @@
 % no to navigation, yes to frame numbering
 \beamertemplatenavigationsymbolsempty
 \setbeamerfont{page number in head/foot}{size=\normalsize}
-\setbeamertemplate{footline}[frame number]
+\setbeamertemplate{page number in head/foot}{\insertframenumber/\insertmainframenumber}
+%\setbeamercolor{page number in head/foot}{fg=red}
+\setbeamerfont{section in head/foot}{size=\small}
+\setbeamercolor{section in head/foot}{fg=gray}
+\setbeamertemplate{section in head/foot}{\textit{\insertsectionhead}}
+%\setbeamertemplate{footline}[frame number]
+\setbeamertemplate{footline}
+{%
+\leavevmode%
+  \hbox{%
+  \begin{beamercolorbox}[wd=.5\paperwidth,ht=2.25ex,dp=1ex,leftskip=1em,rightskip=1em,sep=0pt]{title in head/foot}%
+    \usebeamertemplate*{section in head/foot}%
+    \hfill%
+  \end{beamercolorbox}
+  \begin{beamercolorbox}[wd=.5\paperwidth,ht=2.25ex,dp=1ex,leftskip=1em,rightskip=1em,sep=0pt]{page number in head/foot}%
+	\hfill%
+    \usebeamertemplate*{page number in head/foot}%
+  \end{beamercolorbox}}%
+}
 
 \hypersetup{pdfpagemode=UseNone} % don't show bookmarks on initial view
 
@@ -36,7 +54,7 @@
 
 \date{May $10^{\text{\tiny{th}}}$, 2023}
 
-\author{
+\author[E.T. de Boone]{
 	E.T. de Boone
 	\\
 	\vspace{2em}
@@ -51,6 +69,7 @@
 \frame{	\titlepage }
 }
 
+\section{My studies}
 \begin{frame}{My studies}
 	Studies @Radboud University, Nijmegen
 	\begin{itemize}
@@ -78,6 +97,7 @@
 
 % Context
 %%%%%%%%%
+\section{Radio and Airshowers}
 \begin{frame}{Ultra High Energy particles}
 	\begin{figure}
 		\includegraphics[width=\textwidth]{grand/astroparticletypes_grand.jpg}
@@ -128,7 +148,7 @@
 
 % Radio Interferometry
 %%%%%%%%%%%%%%%%%%%%%%
-\section{Radio Interferometry Concept}
+\section{Radio Interferometry}
 \begin{frame}{Radio Interferometry: Concept}
 	\begin{columns}
 		\begin{column}{0.4\textwidth}
@@ -164,20 +184,23 @@
 
 % My Internship
 %%%%%%%%%%%%%%%
+\section{My Internship}
 \begin{frame}{Timing Constraint for Radio Interferometry}
 	\vspace*{ -2em }
 	Required time accuracy $< 1 \mathrm{ns}$ not provided by GNSS $ \gtrsim 5 \mathrm{ns}$.
 	\vspace{ 2em }
 	\begin{columns}
 		\begin{column}{0.5\textwidth}
-			\visible<2->{Additional synchronisation\\
+			\visible<2->{%
+				Additional synchronisation\\
 				using physics band
-				}
-			\begin{itemize}
-				\item<2-> Pulsed beacon
-				\item<2-> Long period ($\sim 1 \mathrm{\mu s}$)% (AERA)
-				\item<3-> Short period ($\lesssim 20 \mathrm{ns}$)
-			\end{itemize}
+				\begin{itemize}
+					\item Pulsed beacon
+					\item<4-> Continuous (Sine)
+				\end{itemize}
+				\vspace{20pt}
+				\includegraphics[width=\textwidth]{beacon/array_setup_gps_transmitter_cows.png}
+			}%
 		\end{column}
 		\begin{column}{0.5\textwidth}
 			\begin{figure}% Clock error fixes
@@ -190,29 +213,16 @@
 	\end{columns}
 \end{frame}
 
-\begin{frame}{My Internship: Enhancing Timing Accuracy in Air Shower Radio Detectors}
-	\begin{columns}
-		\begin{column}{0.6\textwidth}
-			In-band mechanisms affect physics data;
-			How and how often should we `resynchronise'?
-		\end{column}
-		\begin{column}{0.4\textwidth}
-			\begin{itemize}
-				\item GNSS clock stability
-				\item dead-time
-				\item disruptiveness
-			\end{itemize}
-		\end{column}
-	\end{columns}
-
-	\vfill
+\begin{frame}{Enhancing Timing Accuracy in Air Shower Radio Detectors}
 	\begin{columns}
 		\begin{column}{0.5\textwidth}
-			%\includegraphics<1>[width=\textwidth]{grand/split-cable/split-cable-delays-ch1ch4.pdf}
-			%\includegraphics<2>[width=\textwidth]{grand/split-cable/split-cable-delay-ch1ch2-50mhz-200mVpp.pdf}
+			\centering
+			Pulsed beacon
 			\includegraphics[width=1.1\textwidth]{pulse/time_res_vs_snr_multiple_dt.pdf}
 		\end{column}
 		\begin{column}{0.5\textwidth}
+			\centering
+			Sine beacon
 			\includegraphics[width=1.1\textwidth]{beacon/time_res_vs_snr.pdf}
 		\end{column}
 	\end{columns}
@@ -220,7 +230,7 @@
 
 % Towards GRAND
 %%%%%%%%%%%%%%%%%%%%
-
+\section{GRAND and Interferometry}
 \begin{frame}{GRAND and Interferometry}
 	\begin{columns}
 		\begin{column}{0.6\textwidth}