On Mar 25, 2010, at 19:39 , Elie Moujaes wrote: > what does the negative rho means http://www.quantum-espresso.org/user_guide/node61.html --- Paolo Giannozzi, Dept of Physics, University of Udine via delle Scienze 208, 33100 Udine, Italy Phone +39-0432-558216, fax +39-0432-558222