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</o:shapelayout></xml><![endif]--></head><body lang=EN-GB link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Dear users,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I have a quick question to ask – if I wish to perform epsilon.x in investigating the optical properties, is it not the right choice to use the ultrasoft, but with the norm-conserving pseudopotential when running the scf calculation instead?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Best,<o:p></o:p></p><p class=MsoNormal>Geoffrey<o:p></o:p></p><p class=MsoNormal><span style='font-size:14.0pt;color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;color:black'>+--------------------------------</span><span style='font-size:8.0pt;color:black'>---------------------------------------------</span><span style='font-size:8.0pt;color:black'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'>H.Y Geoffrey Tse, Postdoctoral, <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'>Room N202, Physics Building<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'>Peking University<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'>Haidian District<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'>Beijing 100871<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'>P.R China<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'>Tel: (+86) 18811792348<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt'>Email: geoffrey.tse@pku.edu.cn<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:8.0pt;color:black'>+--------------------------------</span><span style='font-size:8.0pt;color:black'>---------------------------------------------</span><span style='font-size:8.0pt;color:black'><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>