<html><body><div style="font-family: arial, helvetica, sans-serif; font-size: 12pt; color: #000000"><div>Dear developers,</div><div><br data-mce-bogus="1"></div><div>I think that there is an error in the documentation of matdyn.x.</div><div>While in the documentation it is written that the matdyn.eig file contains the phonon eigenvectors and matdyn.modes contains the displacements (eigenvectors divided by the square root of the mass),</div><div>however, if one looks at the subroutine "write_eigenvectors", the eigenvectors are divided by the sqrt of mass., while in the "writemodes" subroutine, the normalized eigenvectors of the dynamical matrix are written.</div><div><br data-mce-bogus="1"></div><div>With regards,</div><div>Prasenjit</div><div>IISER Pune </div></div></body></html>