Thanks for stefano's reply, and I'm also confused the?"lattice specification" 
in PWGUI, which could be descripted?either by celldm() or by 
A,B,C,cosAB,cosAC,cosBC, but?not both.?
If the former method is selected, there?has no problem. However, if I use the 
latter,?the structure?could not be displayed properly in XCrySDen. It seems 
that the angles between vector A and B, A and C, B and C?are defined as alpha, 
beta, and gamma respectively, which?is different?from?the widely-used 
definition (the angles between vector?B and C, A and C,?A and?B?are defined as 
alpha, beta, and gamma respectively). There?may be?a small?bug about specifying 
lattice, either in PWscf or in XCrySDen.
?
======================================
Fan Yang
PH.D Candidate?in Electrochemistry????????????????????? 
College of Chemistry and Molecular Science??????????? 
Wuhan University,430072,Hubei Province,China?
E-mail:shrek_826 at yahoo.com.cn
======================================


      
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