1\section{Conclusion\label{conclusion}}
2In the design (Section \ref{design}) of the scatter plot function \sdd\ emphasis is placed on generality and extensibility
3(Section \ref{extend}).
4These two properties are demonstrated in Section \ref{examples}, as well as the high printout quality.
5A high printout quality and a homogeneous appearance with respect of any other \RR\ (2D) graphics is extremely important
6for publications and presentations. Thus we recommend to use \sdd\ particularly for these purposes.
7
8Other \RR\ related 3D ``tools'' (Section \ref{tools}) are focused on different properties,
9such as surface plotting (e.g. function {\tt persp}), interactivity and online analysis (e.g. \emph{ggobi} or \emph{RGL}).
10
11
12\section*{Acknowledgements}
13The financial support of the Deutsche Forschungsgemeinschaft
14(SFB 475, ``Reduction of complexity in multivariate data structures") is gratefully acknowledged.
15
16We express our sincere thanks to the following people (in alphabetical order)
17for their extensive comments on the features and bugs during the time of development,
18as well as for the discussion of the example data:\\
19Ben Bolker, Anja Busse, Ursula Garczarek, Joachim Hartung, Guido Knapp, Winfried Theis, Brigitta Vo\ss, and Claus Weihs.
20
21