eivec (ps: used in anaddb)
Mnemonics: EIgenVECtors
Characteristic:
Variable type: integer
Default: 0
0 => do not write the phonon eigenvectors;
1 or 2 => write the phonon eigenvectors;
3 => write the phonon eigenvectors, in the lwf-formatted file;
4 => generate output files for band2eps (drawing tool for the phonon band structure);