\input{Figs/Klein.Base.tikz};


\coordinate (P) at (\ThetaP-50:\R);
\coordinate (Q) at (\ThetaQ+10:\R);

\input{Figs/Klein.Cord.tikz};

\coordinate (P) at (\ThetaP-30:\R);
\coordinate (Q) at (\ThetaQ+30:\R);

\input{Figs/Klein.Cord.tikz};
