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[Stephane BECU <stephane.becu@st.com>]

Dear abinit users,

I try to build a supercell for calculating dielectric properties of 
gamma-Al2O3. I begin with an ideal spinel unit, typified by MgAl2O4. Then I 
do some modification of this ideal unit, one of it is to remove two Al atoms 
to create two vacancies. The thing is I do not know how to declare the 
vacancies:
--> do I have to count them like the other atoms in natom?
--> what type (typat) of atoms do I have to define?
--> how define their positions?

Thanks for your help,

Stéphane Bécu