diff --git a/doc/user_guide/en/protocols.adoc b/doc/user_guide/en/protocols.adoc
index 6da33176e..1ff7e61f4 100644
--- a/doc/user_guide/en/protocols.adoc
+++ b/doc/user_guide/en/protocols.adoc
@@ -330,7 +330,7 @@ comparable to tone spacing.
 [width="100%",cols="h,5*^",frame=topbot,options="header"]
 |===
 |T/R Period (s)  |A Spacing Width (Hz)|B Spacing Width (Hz)|C Spacing Width (Hz)|D Spacing Width (Hz)|E Spacing Width (Hz)
-|15|6.67     4.33|13.33     867|26.67     1733|N/A|N/A
+|15|6.67     433|13.33     867|26.67     1733|N/A|N/A
 |30|3.33     217|6.67     433|13.33     867| 26.67     1733| N/A
 |60|1.67     108|3.33     217|6.67     433|13.33     867|26.67     1733
 |120|0.75     49|1.50     98|3.00     195|6.00     390| 12.00     780