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PERMutation * fastID mediumID slowID *

This keyword defines the axes permutations, ie which axis is the fastest
changing, the medium,
and the sectioning. The various axes are identified with the following convention : *x* is 1,
*y* is 2, *z* is 3. For example, to define a valid permutation for a monoclinic space group
with *b* unique, you give ` PERM 3 1 2`. In this case the first argument of
` GRID` should be the number of divisions of the *c* axis, followed by the number of
divisions along *a* and, finally, *b*.
** NOTE WELL : ** Changing the axes permutation without
careful thinking is a standard way to inverse the chirality of your molecule. * GraphEnt* will NOT
stop you from changing enantiomorph.

NMG, Nov 2002