diff --git a/.gitignore b/.gitignore
index 7d3384b..518718e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,4 @@
 *.toc
 *.dat
 *.autosave.xopp
+*.xopp~
diff --git a/ws2020/tut-ana/praesenzaufgaben3.xopp b/ws2020/tut-ana/praesenzaufgaben3.xopp
index 392d094..7966143 100644
Binary files a/ws2020/tut-ana/praesenzaufgaben3.xopp and b/ws2020/tut-ana/praesenzaufgaben3.xopp differ