Used wikipedia commons picture for the binary image

Until now, for the image showing a binary data analysis we were using
an image without a clear copyright statement.

In this commit, that image has been replaced by one from Wikipedia
Commans that has a sharable copyright notice.

4 files changed, 6 insertions, 6 deletions

diff --git a/img/binary-blue.jpg b/img/binary-blue.jpg
new file mode 100644
index 0000000..3901e79
--- /dev/null
+++ b/img/binary-blue.jpg
diff --git a/img/digital-tunnel.jpg b/img/digital-tunnel.jpg
deleted file mode 100644
index c316553..0000000
--- a/img/digital-tunnel.jpg
+++ /dev/null
diff --git a/slides-intro-short.tex b/slides-intro-short.tex
index 9dcfa70..5698cd7 100644
--- a/slides-intro-short.tex
+++ b/slides-intro-short.tex
@@ -463,9 +463,9 @@
 
       \centering
       \vspace{3mm}
-      \includegraphics[width=0.8\linewidth]{img/digital-tunnel.jpg}\\
+      \includegraphics[width=0.88\linewidth]{img/binary-blue.jpg}\\
       \vspace{-0.6mm}
-      \tiny \href{https://tsongas.com/newsletter_articles/the-new-electronic-version-of-the-advantage/digital-tunnel-wallpaper/}{https://tsongas.com}
+      \tiny \href{https://commons.wikimedia.org/wiki/File:Binary_blue.jpg}{Wikimedia Commons}
     \end{columns}
   \end{frame}
 
diff --git a/slides-intro.tex b/slides-intro.tex
index d4a90b1..5e67ae7 100644
--- a/slides-intro.tex
+++ b/slides-intro.tex
@@ -344,7 +344,7 @@ for computational reproducibility]
         \vspace{-5mm}
         \includegraphics[width=0.7\linewidth]{img/hale-prime-focus-marked.jpg}\\
         \vspace{-0.6mm}
-        \tiny \href{http://slittlefair.staff.shef.ac.uk/teaching/phy217/lectures/telescopes/L07/index.html}{http://slittlefair.staff.shef.ac.uk}
+        \tiny \href{https://slittlefair.staff.shef.ac.uk/teaching/phy217/lectures/telescopes/l07}{http://slittlefair.staff.shef.ac.uk}
       \end{center}
 
       \column{0.5\linewidth}
@@ -372,7 +372,7 @@ for computational reproducibility]
         \vspace{-5mm}
         \includegraphics[width=0.7\linewidth]{img/hale-prime-focus.jpg}\\
         \vspace{-0.6mm}
-        \tiny \href{http://slittlefair.staff.shef.ac.uk/teaching/phy217/lectures/telescopes/L07/index.html}{http://slittlefair.staff.shef.ac.uk}
+        \tiny \href{https://slittlefair.staff.shef.ac.uk/teaching/phy217/lectures/telescopes/l07}{http://slittlefair.staff.shef.ac.uk}
       \end{center}
 
       \column{0.5\linewidth}
@@ -390,9 +390,9 @@ for computational reproducibility]
 
       \centering
       \vspace{3mm}
-      \includegraphics[width=0.8\linewidth]{img/digital-tunnel.jpg}\\
+      \includegraphics[width=0.88\linewidth]{img/binary-blue.jpg}\\
       \vspace{-0.6mm}
-      \tiny \href{https://tsongas.com/newsletter_articles/the-new-electronic-version-of-the-advantage/digital-tunnel-wallpaper/}{https://tsongas.com}
+      \tiny \href{https://commons.wikimedia.org/wiki/File:Binary_blue.jpg}{Wikimedia Commons}
     \end{columns}
   \end{frame}