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[asila101@gmail.com]

dear abinit users,

  I'm caculating the phonon structure on gamma point of PbTiO3, and get the 
results after running anaddb program. My question is that:
  Which unit does the displace vector use, fractional or Bohr?
  The following is the result it produce:

Eigendisplacements
 (will be given, for each mode : in cartesian coordinates
   for each atom the real part of the displacement vector,
   then the imaginary part of the displacement vector)
  Mode number    4   Energy    3.245758E-04
;  1  8.54507677E-04  0.00000000E+00  0.00000000E+00
;     0.00000000E+00  0.00000000E+00  0.00000000E+00
;  2 -1.01832070E-03  0.00000000E+00  0.00000000E+00
;     0.00000000E+00  0.00000000E+00  0.00000000E+00
;  3 -2.92325135E-03  0.00000000E+00  0.00000000E+00
;     0.00000000E+00  0.00000000E+00  0.00000000E+00
;  4 -2.86367260E-03  0.00000000E+00  0.00000000E+00
;     0.00000000E+00  0.00000000E+00  0.00000000E+00
;  5 -2.23204202E-03  0.00000000E+00  0.00000000E+00
;     0.00000000E+00  0.00000000E+00  0.00000000E+00


  Thanks a lot!


yours, asila