<|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:
3.0 4.4 6.5
90 101 90
Ca
0.81 0.00 0.64
Nb
0.97 0.19 0.42
Nb
0.85 0.00 0.68
Os
0.93 0.19 0.75
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
3.0 4.4 6.5
90 101 90
Ca
0.81 0.00 0.64
Nb
0.97 0.19 0.42
Nb
0.85 0.00 0.68
Os
0.93 0.19 0.75
Identify the crystal system.