I'd like to have the tick label for the y-axis only printed *once* in a groupplot. This would be very useful for the case when one uses the following options:

```
ylabels at=edge left,
yticklabels at=edge left,

```

Is this possible?

Picture
-------

![enter image description here](https://i.stack.imgur.com/vLg4J.png)

MWE
---

```
\documentclass[
a4paper
]{scrartcl}

\usepackage{
amsmath,
tikz,
pgfplots,
}

\usepgfplotslibrary{
groupplots,
}

\usepackage{lmodern}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}

\begin{document}
\begin{center}
\begin{tikzpicture}[font=\small]
\begin{groupplot}[
group style={
    group size=4 by 4, %4 column(s), 4 row(s)
    horizontal sep=0cm,
    vertical sep=1.5cm,
    ylabels at=edge left,
    yticklabels at=edge left,
},
xlabel={Bla},
ylabel={Process},
%
every x tick scale label/.append style={
    at={(0.95,0)},yshift=-1.5em,anchor=north,inner sep=0pt
},
every y tick scale label/.append style={
    at={(-0.05,0.99)},anchor=east,inner sep=0pt
},
scale ticks above exponent={2}
]
\nextgroupplot
\addplot[only marks] coordinates{(1,1200) (3,500)};
\nextgroupplot
\addplot[only marks] coordinates{(2,1200) (4,400)};
\end{groupplot}
\end{tikzpicture}
\end{center}
\end{document}

```