[xcrysden] forces in crystal

[Tone Kokalj]

> Hi,
>
> I'm writing a set of script too convert output from PARSEC
> (http://www.ices.utexas.edu/parsec/) to XSF format.
>
> It is unclear to me when periodic boundaries are employed if the forces
> in primvec are given in absolute coordinate or given relative to the
> primitive lattice vectors.

Forces components are Cartesian in XSF file. About the unit nothing is
assumed. The numbers are simply taken as such from the file.

See: http://www.xcrysden.org/doc/XSF.html#__toc__5

Regards, Tone