DISP file is automatically created by the first step of fropho run. The lines correspond to least atomic displacements. The first column is the atom number in supercell. The later three columns give a displacement vector whose values correspond to quantities of a, b and c axes, respectively. The displacement vectors are the results of symmetry analysis, but are just examples. You can modify or add directions of displacements though the atomic number can not be modified. More directions may improve quality of phonon frequencies.
	  1   1.00   0.00   0.00
	  1   0.00   0.00   1.00
	 19   1.00   0.00   0.00
	 19   0.00   0.00   1.00

togo 2009-02-12
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