<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;"><DIV>Dear pwscf users!</DIV>
<DIV>I run ph.x for a grid of qs and there is not any negative freqency but as I run matdyn.x they emerg what should I do ? </DIV></td></tr></table><br>