The CharDen-Fe2 directory
contains the charge density file RHO, calculated for a metallorganic
molecular crystal 'C24 H22 Fe2 N12 S8' with an antiparallel setting
of spins at two Fe atoms:
AFM.XV
and 
AFM.RHO
(binary, obtained on an Intel processor).

Exercise:

1. using 'xv2xsf', obtain a .XSF file representing the crystal structure.
Try different modi of vosualization, number of cells drawn, etc.
The resulting file (as it will be overwritten by the following task)
is saved as
cell.XSF

2. using 'rho2xsf', produce a .XSF file, containing the grid with
the charge density data, resolved over spins. Select a reasonable
(not too large) visualization box and number of divisions.
In case of a problem reading the binary .RHO on a different machine,
use the prepared file box.XSF, corresponding to some selection of 
a visualization box, containing both Fe atoms.
Get the images of charge density within the box, represented by
isosurfaces and/or with contour plots in the cutting planes.
Try the animation modus, as a cutting plane moves through the simulation cell.

3. With the same .XSF file, render a representation of magnetic density,
choosing the weights +1 and -1 for the spin-up and spin-down densties.
