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@@ -551,6 +551,8 @@ The parameters are
\item $\lambda = \verb|Minkowski_gauge_wave__lambda|$, the wavelength
\item $\delta = \verb|Minkowski_gauge_wave__phase|$, the phase shift
\end{itemize}
+A plane wave has $\omega = \pm \lambda$ for a wave that travels in the
+$x$ direction, and $\omega = \pm \lambda \sqrt{2}$ for a diagonal wave.
If the Boolean parameter \verb|Minkowski_gauge_wave__diagonal| is true,
then we make the gauge wave travel diagonally across the grid by the