[Pw_forum] in ralax out file :what the tau( 1) stand for ?

[xu yuehua]

 hi all
i want to check the the position of atoms generateing from my input ,but i
do not know the "tau "stands for

outfile:

 Cartesian axes

     site n.     atom                  positions (a_0 units)

         tau(  1) = (   0.0955000  -0.0222921   0.0877964  )
           tau(  2) = (   0.1203713   0.0259950   0.1476673  )
         tau(  3) = (  -0.0913367  -0.0311881   0.0864053  )
         tau(  4) = (  -0.0933862  -0.0952227   0.0371086  )
         tau(  5) = (  -0.1146783   0.0578960   0.1453950  )
          tau(  6) = (  -0.0622673   0.0735890   0.0858806  )
          tau(  7) = (   0.0005149  -0.0944603   0.1013409  )
         tau(  8) = (   0.0589802  -0.1140741   0.1536128  )
wish your assist
-- 
Xu Yuehua
physics Department of Nanjing university
China
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