\begin{table}%t2
 \caption{\label{t:obs}List of observations and measured CH and \CHP\ equivalent
 widths (in m\AA; uncertainties as estimated in Sect. 3.2.1 are given in
 upper index).}
%\centerline
{\begin{tabular}{cccccccc}
 \hline\hline
 Epoch & Observatory & $R^a$ & $W_{4300}$(CH) [m\AA]& $W_{4232}$(CH$^+$)& $W_{4300}$(CH)& $N$(CH)$^c$& $N$(\CHP)$^c$\\
       &       & & \multicolumn{2}{c}{HD~34078}&   \zper& \multicolumn{2}{c}{HD~34078} \\
 \hline\noalign{\smallskip}
 2002.73&            &       &  $57.35^{0.92}$    & $47.30^{1.51}$ & ---	       & $0.97^{0.02}$ & $0.69^{0.02}$\\
 2003.15&           &       &  $54.06^{0.76}$   & $44.50^{1.19}$ & $15.05^{0.39}$      & $0.89^{0.01}$& $0.63^{0.02}$\\
2003.71&            &       &  $52.36^{0.93}$    & $46.44^{1.30}$ &$16.22^{0.46}$      & $0.85^{0.02}$ & $0.67^{0.02}$\\
2003.96&            &       &  $55.54^{1.77}$    & ----& $15.26^{0.58}$                & $0.92^{0.03}$&---\\
2004.15& OHP/ELODIE$^b$ & 32~000  &  $51.94^{0.81}$    & $46.66^{1.30}$& $16.22^{0.99}$& $0.84^{0.01}$& $0.67^{0.02}$ \\
2004.88&            &       &  $54.70^{1.20}$    & ----& ----                          & $0.90^{0.02}$&---\\
2005.72&            &       &  $51.30^{0.90}$    & $45.36^{1.40}$& $15.16^{0.64}$      & $0.82^{0.01}$& $0.65^{0.02}$\\
2006.11&            &       &  $48.97^{0.95}$    & $42.01^{1.40}$& ----                & $0.77^{0.01}$& $0.58^{0.02}$\\
\hline\noalign{\smallskip}
2006.71&    &   & $54.91^{0.32}$&   $44.23^{0.52}$& $15.98^{0.13}$                     & $0.909^{0.005}$& $0.623^{0.007}$\\
2007.14& OHP/SOPHIE  & 75~000   & $51.00^{0.51}$&   $41.30^{0.45}$& $16.01^{0.26}$     & $0.815^{0.008}$& $0.563^{0.006}$ \\
2007.67&    &   & $53.30^{0.36}$&   $45.33^{0.47}$& $16.05^{0.13}$                     & $0.869^{0.006}$& $0.646^{0.007}$ \\
2008.10&    &   & $54.16^{0.30}$&   $48.29^{0.43}$& $16.22^{0.15}$                     & $0.890^{0.005}$& $0.710^{0.006}$ \\
\hline\noalign{\smallskip}
2003.00&    &   & $55.50^{0.28}$&   $44.78^{0.45}$& $15.80^{0.14}$                     & $0.880^{0.004}$& $0.632^{0.006}$ \\
2004.02&    &   & $52.10^{0.32}$&   $47.00^{0.51}$& $14.90^{0.36}$                     & $0.816^{0.005}$& $0.672^{0.007}$\\
2004.76&    &   & $50.80^{0.69}$&----& $15.70^{0.29}$                                  & $0.816^{0.01}$&---\\
2004.98& McDonald    & 170~000  & $53.10^{0.33}$&   $47.30^{0.57}$& $15.70^{0.18}$     & $0.843^{0.005}$& $0.697^{0.008}$\\
2005.81&    &   & $49.00^{0.26}$&   $44.90^{0.60}$& $16.00^{0.08}$                     & $0.763^{0.004}$& $0.636^{0.009}$ \\
2005.99&    &   & $49.90^{0.22}$&   $43.50^{0.60}$& $16.15^{0.11}$                      & $0.774^{0.003}$ & $0.613^{0.008}$\\
2007.02&    &   & $53.20^{0.40}$&   $42.70^{0.42}$& $15.88^{0.18}$                    & $0.832^{0.006}$ & $0.595^{0.006}$ \\
2008.00&    &   & $54.34^{1.08}$&   $47.88^{1.64}$& $15.74^{0.15}$                     & $0.90^{0.02}$ & $0.68^{0.02}$ \\
\hline\noalign{\smallskip}
2004.10& BOAO    & 30~000  & $52.50^{0.45}$&  ----& ---                                          & $0.850^{0.007}$ & ---\\
2004.18& BOAO-Terskol    & 30~000--120~000  & $50.67^{0.35}$&  ----&---                                 & $0.807^{0.006}$ &---\\
2006.77& BOAO  & 45~000 & $54.60^{0.62}$&   $44.40^{0.60}$& ---                                 & $0.90^{0.01}$ & $0.627^{0.008}$ \\
\hline\noalign{\smallskip}
2004.65& Terskol& 120~000&	 $55.00^{0.45}$& ----& ---                             & $0.911^{0.007}$ &---\\
\hline\noalign{\smallskip}
2007.18& Calar Alto& 40~000 &	 $52.15^{0.88}$& $41.80^{0.95}$& ---                            & $0.84^{0.02}$ & $0.57^{0.01}$ \\
\hline
\end{tabular}}
\medskip
\par
$^a$\ Resolution near \CHl. $^b$\ \WCHl\ and \WCHPlb\ values from OHP/ELODIE spectra
have been corrected by +6\% and +8\% respectively (see text). $^c$\
 Column densities in units of $10^{14}$ \units{cm}{-2}, measured
 directly from line profiles for high resolution spectra (McDonald) or 
computed from $W$ values using Eqs.~(1) and~(2) for other data.
\end{table}