So that they align vertically with definition lists.
@@ -34,7 +34,7 @@ $endif$
\setupwhitespace[medium]
-\setupblackrules[width=25mm, color=rulecolor]
+\setupblackrules[width=31mm, color=rulecolor]
\setuphead[chapter] [style=\tfd]
\setuphead[section] [style=\tfd\bf, color=titlegrey, align=middle]