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GRID * nfast nmedium nslow*

This keyword sets the number of (integer)
divisions along the whole unit cell edges for the
fast, medium and slow axes. Which axis is fast, medium and slow is determined by the
` PERMutation`
keyword. To keep the FFT as fast as possible, * GraphEnt* will only cooperate
if the grid sizes are any of the following :

1, 2, 4, 6, 8, 10,
12, 14, 16, 20, 24, 28,
30, 32, 40, 42, 48, 56,
60, 64, 70, 80, 84, 96,
112, 120, 128, 140, 160, 168,
192, 210, 224, 240, 256, 280,
320, 336, 384, 420, 448, 480,
512, 560, 640, 672, 768, 840,
896, 960, 1024

If you need more than 1024 grid points on any axis, then you are better off finding a
program encoding for a more efficient maximum entropy
algorithm (because with * GraphEnt* you will probably never finish the calculation).

NMG, Nov 2002