[Pw_forum] volume optimization

[berber mo]

I work on wien2k 8 and i have problem with volume optimization .
I would like to know in detail how to optimize the volume
a =15.95 u.a               b = 19.53 u.a                           c =15.95 u.a
alpha=90 °                  beta =90 °                                  gamma =144.73 °
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