Which convention dose the optimized crystal structure use?

[Dai Tang]

Dear CP2K community,

I did the cell and geometry optimisation of a crystal structure. The final 
optimised lattices parameters (a', b', c', alpha', beta', gamma') is 
different from the input parameters (a, b, c, alpha, beta, gamma). What is 
the Cartesian frame used in the output .xyz file? Is it consistent with the 
input cell parameters or the final optimised ones? 

My guess is that it is consistent with the optimised lattice parameters, 
namely, X//a', Y//(a' x b') x a' and Z//(a' x b'). I really appreciate if 
someone can confirm this. 


Thank you.

Dai
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