<|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:
6.3 6.3 3.3
102 102 120
Nb
0.00 0.00 0.00
Sb
0.13 0.00 0.00
Pb
0.81 0.75 0.48
Pb
0.81 0.25 0.48
Identify the crystal system.<|im_end|>
<|im_start|>assistant
Given the following crystal representation:
6.3 6.3 3.3
102 102 120
Nb
0.00 0.00 0.00
Sb
0.13 0.00 0.00
Pb
0.81 0.75 0.48
Pb
0.81 0.25 0.48
Identify the crystal system.