<|im_start|>system
Please reason step by step, and put your final answer within \boxed{}.<|im_end|>
<|im_start|>user
Given the following crystal representation:
4.5 4.5 8.4
102 102 54
Ba
0.53 0.00 0.18
Ba
0.43 0.00 0.90
Cu
0.00 0.00 0.00
Os
0.98 0.00 0.04
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
4.5 4.5 8.4
102 102 54
Ba
0.53 0.00 0.18
Ba
0.43 0.00 0.90
Cu
0.00 0.00 0.00
Os
0.98 0.00 0.04
Identify the crystal system.