This package provides a kspace style which is a wrapper for the ScaFaCoS long-range Coulomb solver library. The library provides a selection of different long-range Coulomb solvers, which can be used to calculate the Coloumic forces between charged particles. More information about the ScaFaCoS library can be found on this web site: http://scafacos.de. ScaFaCoS was designed and implemented by a consortium of German universities (Bonn, Chemnitz, Stuttgart, Wuppertal and others) and the Juelich Supercomputing Centre (Forschungszentrum Juelich). The use of the scafacos kspace requires the download and installation of the library on the system. This can be done in lib/scafacos or elsewhere in your system. Details of the download and build process for ScaFaCoS are given in the lib/scafacos/README file and it can also be done via the make lib-user-scafacos command from the LAMMPS source directory. Once you have successfully built LAMMPS with this package and the ScaFaCoS library, you can test it using an input file from the examples scafacos dir, e.g.: lmp_serial -in lammps/examples/PACKAGES/scafacos/in.scafacos.fmm For questions about ScaFaCoS, please contact: r.halver@fz-juelich.de or g.sutmann@fz-juelich.de