<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:12pt"><div>Dear Prof. Blaha and Users<br></div><div><br></div>for calculations of optic properties (page 157 of UG), in the metalic system we should put "TETRA = 101". <br>As you know GGA functional fails to find a gap for correlated electron systems and it predics a metallic behavior.<br>My question is, should we put "TETRA = 101" for the correlated electron systems?<br>Best Regards? <br> <br>Ali</div></body></html>