**Table 1:** Stellar parameters of the high mass CSPN from PHM, heliocentric radial velocities (from Durand et al. 1998) and proper motion measurements. The last column gives the source of the proper motion values.
$\begin{displaymath}{\small \begin{tabular}{llccclr@{$~\pm~$}lr@{$~\pm~$}lr@{$~\p... ...84.1&4.7 &$-$1.6&2.2 &$-$11.4&2.2 &TY2\\ \hline \end{tabular}} \end{displaymath}$ TY2: Tycho-2 catalogue (Høg et al. 2000); TRC: Tycho reference catalogue (Høg et al. 1998).

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