diff --git a/contents/slides/frequenzspektrum.md b/contents/slides/frequenzspektrum.md
index c8e43ea..0ec4a37 100644
--- a/contents/slides/frequenzspektrum.md
+++ b/contents/slides/frequenzspektrum.md
@@ -8,7 +8,7 @@
 </note>
   
 --- style="font-size: 0.5em;"
-| r | c |  r | X | l |
+| r: | c: | r: | X: | l: |
 | $\qty{30}{\kilo\hertz}$ | - | $\qty{300}{\kilo\hertz}$ | Low Frequency | LF |
 | | | | (Langwelle) | (LW) |
 | $\qty{300}{\kilo\hertz}$ | - | $\qty{3000}{\kilo\hertz}$ | Medium Frequency | MF |