3D-Plot: Beschriftung verschieben

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\documentclass[tikz,margin=10pt]{standalone}
\begin{document}
\begin{tikzpicture}[>=latex,
  x={(0.7cm,0.7cm)},y={(1cm,0cm)}, z={(0cm,1cm)},
  punkt/.style={circle,draw,fill=#1,inner sep=0pt,minimum size=9pt},
  punkt/.default=white,
  nummer/.style={},
  %% Zum Einblenden der Koordinatennummern
  %nummer/.style={label={[red,font=\tiny,label distance=2mm]below:#1}}
  ]
% zweidimensionales Gitter
\draw[very thin, lightgray,step=1mm](0,0)grid(3cm,4cm);
% Achsen
\draw[->] (0,0,0) -- (4,0,0) node[above]{$S$};
\draw[->] (0,0,0) -- (0,4,0) node[below,align=left]{Zwischen-\\schritte};
\draw[->] (0,0,0) -- (0,0,4) node[left]{$\xi$};
% Achseneinteilung
\newcommand\xcoords{{1,2,3}}\newcommand\imax{2}
\newcommand\ycoords{{0,1,4.5}}\newcommand\jmax{2}
\newcommand\zcoords{{0,2.5,5}}\newcommand\kmax{2}
% Gitterpunkte benennen
\foreach[evaluate={\x=\xcoords[\i]}] \i in {0,...,\imax}
  \foreach[evaluate={\y=\ycoords[\j]}] \j in {0,...,\jmax}
    \foreach[evaluate={\z=\zcoords[\k]}] \k in {0,...,\kmax}
      \coordinate[nummer=\i\j\k](c\i\j\k)at(\x,\y,\z);
%%% -------------------------------------------------------------------------------
\begin{scope}[node font=\scriptsize]
  % Punkte einzeichnen
  \node[punkt=lightgray,
    label=above:{$J(\xi_{j},1,N-4)$}
    ](p011)at(c011){?};
\end{scope}
\end{tikzpicture}
\end{document}
 
 
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