8
 
Na    2.0763096    2.0763096   -2.0763096 
Na    1.2670936   -1.2670936   -1.2670936 
Na   -2.0763096   -2.0763096   -2.0763096 
Na    2.0763096   -2.0763096    2.0763096 
Na    1.2670936    1.2670936    1.2670936 
Na   -2.0763096    2.0763096    2.0763096 
Na   -1.2670936   -1.2670936    1.2670936 
Na   -1.2670936    1.2670936   -1.2670936 
