<|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:
5.3 5.3 4.2
90 90 90
Na
0.63 0.63 0.00
Na
0.00 0.00 0.00
Br
0.63 0.00 0.21
Br
0.00 0.63 1.00
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
5.3 5.3 4.2
90 90 90
Na
0.63 0.63 0.00
Na
0.00 0.00 0.00
Br
0.63 0.00 0.21
Br
0.00 0.63 1.00
Identify the crystal system.