\begin{figure*}[t]
\centering
\includegraphics[angle=0,scale=0.63]{h3vr.pdf}
\includegraphics[angle=0,scale=0.63]{h3em.pdf}
\includegraphics[angle=0,scale=0.63]{h3r.pdf}
\includegraphics[angle=0,scale=0.63]{h3ew.pdf}
\includegraphics[angle=0,scale=0.63]{h3v.pdf}
\includegraphics[angle=0,scale=0.63]{h3ic.pdf}
\caption{Long-term spectral variations of the \ha line profile. From top to
bottom: Left panels: the ratio of the violet and red emission peak strength, normalized flux of the $V$ peak, normalized flux of the $R$ peak.
Right panels: mean of the normalized fluxes in the $V$ and $R$ peak,
equivalent width of the whole line, and central intensity of the core absorption.
Data from the higher-resolution Elodie, Feros, and DAO are shown by blue
circles, those from OND by the red circles, those from the BeSS amateur
spectra by the green circles, those from the Trieste spectra
re-reduced by us by magenta circles, and those from the literature by
the black circles.}\label{eqwh3}
\end{figure*}

