\tikzset{big arrow/.style={ -Stealth,line cap=round,line width=1mm, shorten <=1mm,shorten >=1mm}} \newcommand\catholic[2]{\draw[big arrow,green!25!white] (root #1) to (root #2);} \newcommand\protestant[2]{ \begin{scope}[transparency group, opacity=.25] \draw[big arrow,orange] (root #1) to (root #2); \end{scope}} \begin{dynkinDiagram}[edge length=1.2cm, indefinite edge/.style={thick,loosely dotted}, labels*={0,1,2,3,\ell-3,\ell-2,\ell-1,\ell}]{D}[1]{} \catholic{0}{6}\catholic{1}{7} \protestant{7}{0}\protestant{6}{1} \end{dynkinDiagram}