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Abinitiors:
hi, I am a new beginner of Abinit.
I feel confused in some basic definations as following:
1) etotal is definated as the ration of energy to a reduced cell, or a single 
  atom, or cell volume? If it is the first, how to calculate the single atom
   energy in a cell consisting of A kind and B kind atoms?
2) about K- point sampling:
  when I set up a supercell in a fcc Al, the basic vectors of supercell are
    1/2[1 0 -1]    1/2[0 1 -1]  [1 1 1]
  in fact this crystal structure is the same as f.c.c.,   but the etotal by 
this slab is different from the result by f.c.c at the 0.0x Ha!
 my ecut is 6.0 as the tutorial 4.3,
 what cause this difference? how to solve this question?

thank you

ps. I suggest the Tutorial should give a defination list which will ease the 
beginner's learning. however, wish high level users can guide me a bit!