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Dear friends,

During a RF calculation, if one wants to do the perturbations of n atoms,
usually he/she calculates them in a single file by using rfatpol 1 n. 


I wonder if we can speed the RF calculation by splitting it into several
separate files, such as 
     file1: rfatpol 1  i 
     file2: rfatpol i+1 j
     file3: rfatpol j+1 n
Then the files can be submitted at the same time; when they finish, one can
merge their DDBs.


I tested the forementioned methods in several systems, and most of them give
almost the same results, except a two-atom system.  My question is: are the 
two
ways equivalent in principle?


Thanks.

Sincerely,
Gunagfu Luo