%
% tkz-namedgraphs (27/05/2011)
%
% Coding (utf8) Creator (TeX) 
% Author Alain Matthes
\input{tkzpreamblenamed.ltx}

\begin{document}

    \begin{tikzpicture}[scale=.7]
       \GraphInit[vstyle=Shade]
       \SetVertexNoLabel
       \SetGraphShadeColor{blue!50!black}{blue}{gray}
       \grChvatal[RA=6,RB=2]
    \end{tikzpicture}

\end{document}