# pgfplots, units and stale labels in groupplots

Today, a colleague of mine came up with this problem

Between the two groupplots, there is a additional label [K] which he liked to get rid of. The relevant source part was

\begin{groupplot}[
y unit=K
]
\nextgroupplot
};
\nextgroupplot
\end{groupplot}
\nextgroupplot[y unit=K]
\nextgroupplot[y unit=]