# rho keywords

Density options

## rho.in

RESCU uses the neutral atom density as an initial guess for
self-consistent calculations. It is also possible to provide an initial
density. This is done by setting rho.in to the path of a file containing
the initial density. The data should be saved in HDF5 format under the
group /rho/rhoOut. This may be achieved using the function
writeDistArray. For non-self-consistent calculations, the converged
ground state density is passed to RESCU using rho.in. It is not
necessary to specify the extension as it is assumed to be .h5.

**type**: `string`

**example**: `rho.in = './results/si_scf'`
