[Pw_forum] average.x

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Hi 
I want to calculate the work function for slab ,Iread
every thing abuot it in the fourm and made pp.x and
average .x but I have some questions please answer me
:1- what is the difference between column 1 and 2 in
the output of average.x 
2- In which units the potentials in the output of
average.x is it Ryd
3-What is the difference between planner average and
macroscopic average ,how we can calculate planner
average .
4-Regfering to J.phy.condens.matter 
11(1999),2689-2696 ,how can I choose the mean
electrostatic potential as areference for Efermi and
macroscopic potential . please answer me ,thanks.  

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