which is the power voltage delivered,
not the fast switching waves in every cycle,
that is of interest to the designers.
-As shown in Fig.~\ref{fig:ef1}, the solid line is
+As shown in Figure~\ref{fig:ef1}, the solid line is
the waveform of the output node in a Buck
converter~\cite{Krein:book'97}, the dots are the simulation points
of SPICE\index{SPICE}, and the appended dash line is the envelope.
switching power converters, the waveform of the carrier in
consequent cycles does not change much, envelope-following method
is an approximation analysis method, which skips over several
-cycles (the dash line in Fig.~\ref{fig:ef2}), the so called
+cycles (the dash line in Figure~\ref{fig:ef2}), the so called
envelope step, without simulating them, and then carries out a
correction, which usually contains a sensitivity-based Newton
iteration or shooting until convergence, in order to begin the
