<DIV>Dear Kevin,Stefaan, and Peter,</DIV>
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<DIV>Thanks very much for your excellent comments. Due to the small RMT for H and O, the interstitial region is around 90 percentage of the unit cell in my case. I think this cause the negative fermi energy as Stefaan stated. To avoid the warning of this reduced RKMax, I can simply increase the NMATMAX. </DIV>
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<DIV>Thanks again.</DIV>
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<DIV>Cheers </DIV><BR><BR>Yanming Ma Ph.D<br>Steacie Institute for Molecular Sciences,<br>National Research Councils of Canada,<br>Ottawa, Ontario<br>K1A 0R6<br>Canada<p><hr SIZE=1>
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