<div dir="ltr"><div><div><div><div><div><div>Dear QE users and developers<br></div>What is the meaning of the f vector in the symmetry operations?<br></div>For example (from the PW output):<br><br>isym = 6    120 deg rotation - cart. axis [-1,1,1]      <br>cryst.  s( 6) = (    0         0        -1     )   f =( 0.0000000 )<br>                   (   -1         0         0     )      ( 0.5000000 )<br>                  (    0         1         0     )      ( 0.5000000 )<br><br> cart.   s( 6) = ( 0.0000000 -1.0000000 0.0000000 )   f =( 0.0000000 )<br>                   ( 0.0000000 0.0000000 1.0000000 )      ( 0.5000000 )<br>                   ( -1.0000000 0.0000000 0.0000000 )      ( 0.5000000 )<br><br><br></div>Thank you very much<br></div>Uri Argaman<br></div>Ben-Gurion University<br></div>Israel<br></div>