Improve tick label example

chapters/annotations.tex

@@ -223,7 +223,7 @@ \subsubsection{Axis Properties}\label{axis-properties}
 
 The mandatory \lstinline!factor! is used to define a tick label conversion according to $y \mapsto \text{\lstinline!factor!}\, \operatorname{log}_{10}(y)$.
 This mapping shall be applied before presenting values in tick labels.
-It is recommended that value of \lstinline!factor! is somehow indicated on the axis or its tick labels, for example by presenting a major tick label as $8\, \mathrm{dB}_{20}$.
+It is recommended that value of \lstinline!factor! is somehow indicated on the axis or its tick labels, for example by presenting a major tick label as $-40\, \mathrm{dB}_{20}$.
 Major axis ticks are preferred at integer converted values, and minor ticks should be placed at evenly distributed converted values (similar to a linear axis scale).
 
 \begin{nonnormative}