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% short description of MD++ command
%  changeH_keepS

Same as {\tt changeH\_keepR} except that the scaled
coordinates of the atoms $\textbf{s}^{i}$ remain constant.
The real coordinates $\textbf{r}^{i}$ change because
$\textbf{r}^{i}=\textbf{H}\cdot\textbf{s}^{i}$.
%
Same as {\tt shiftbox}.
