I have this table
\documentclass[a4paper]{scrartcl}
\usepackage{longtable}
\begin{document}
\begin{longtable}{c|p{6cm}p{4cm}p{4cm}}
\hline
Blub & Bla & Blip & Blop \\
Blub & Bla & Blip & Blop \\
\hline
\end{longtable}
\end{document}
Now, for whatever reason, I would like to center ONE cell of the second column. How would I achieve that?