[Wien] Problem in structure optimization

[AJAY SINGH VERMA]

Dear Sir,

I am facing some problem in structural optimization. When i perform my calculation with variable volume percentage from -6 to 6 with difference 1. In starting the complete scf cycle run but when 6% volume term comes error massage shown  "ifft so small in xcpot3". As per the previous mailing  i change ifft parameter from 75 75 75 to 0 0 0 and enhancement factor from 1.0 to 2.0.in in0 file after that complete cycle run and curve is completely plotted.
I have some questions:-
What is the effect of this change?
does it change the value of crystal parameter?
what it represent?

Thanking you
Ajay Singh Verma
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