On Dec 9, 2010, at 19:00 , Elie Moujaes wrote: > If my electric field is in the z-direction, does it mean that gdir > = 3? in most cases, yes. Crystal axis are reprinted in the output P. --- Paolo Giannozzi, Dept of Chemistry&Physics, Univ. Udine via delle Scienze 208, 33100 Udine, Italy Phone +39-0432-558216, fax +39-0432-558222