<|im_start|>system
Please reason step by step, and put your final answer within \boxed{}.<|im_end|>
<|im_start|>user
Given the following CIF representation:
data_NbSi3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.14
_cell_length_b   13.78
_cell_length_c   5.03
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NbSi3
_chemical_formula_sum   'Nb6 Si18'
_cell_volume   356.17
_cell_formula_units_Z   6
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Nb  Nb0  1  0.0  0.89  0.89  1.0
  Nb  Nb1  1  0.0  0.63  0.14  1.0
  Nb  Nb2  1  0.0  0.15  0.14  1.0
  Nb  Nb3  1  0.57  0.0  0.14  1.0
  Nb  Nb4  1  0.57  0.52  0.89  1.0
  Nb  Nb5  1  0.57  0.26  0.89  1.0
  Si  Si6  1  0.9  0.3  0.6  1.0
  Si  Si7  1  0.9  0.48  0.6  1.0
  Si  Si8  1  0.8  0.89  0.55  1.0
  Si  Si9  1  0.9  0.0  0.49  1.0
  Si  Si10  1  0.81  0.19  0.43  1.0
  Si  Si11  1  0.81  0.59  0.43  1.0
  Si  Si12  1  0.0  0.0  0.74  1.0
  Si  Si13  1  0.0  0.87  0.7  1.0
  Si  Si14  1  0.0  0.91  0.7  1.0
  Si  Si15  1  0.24  0.3  0.6  1.0
  Si  Si16  1  0.24  0.48  0.6  1.0
  Si  Si17  1  0.33  0.89  0.55  1.0
  Si  Si18  1  0.23  0.0  0.49  1.0
  Si  Si19  1  0.33  0.19  0.43  1.0
  Si  Si20  1  0.33  0.59  0.43  1.0
  Si  Si21  1  0.57  0.89  0.29  1.0
  Si  Si22  1  0.57  0.98  0.33  1.0
  Si  Si23  1  0.57  0.8  0.33  1.0

What is the crystal system of this material?<|im_end|>
<|im_start|>assistant
Given the following CIF representation:
data_NbSi3
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.14
_cell_length_b   13.78
_cell_length_c   5.03
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   NbSi3
_chemical_formula_sum   'Nb6 Si18'
_cell_volume   356.17
_cell_formula_units_Z   6
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
  Nb  Nb0  1  0.0  0.89  0.89  1.0
  Nb  Nb1  1  0.0  0.63  0.14  1.0
  Nb  Nb2  1  0.0  0.15  0.14  1.0
  Nb  Nb3  1  0.57  0.0  0.14  1.0
  Nb  Nb4  1  0.57  0.52  0.89  1.0
  Nb  Nb5  1  0.57  0.26  0.89  1.0
  Si  Si6  1  0.9  0.3  0.6  1.0
  Si  Si7  1  0.9  0.48  0.6  1.0
  Si  Si8  1  0.8  0.89  0.55  1.0
  Si  Si9  1  0.9  0.0  0.49  1.0
  Si  Si10  1  0.81  0.19  0.43  1.0
  Si  Si11  1  0.81  0.59  0.43  1.0
  Si  Si12  1  0.0  0.0  0.74  1.0
  Si  Si13  1  0.0  0.87  0.7  1.0
  Si  Si14  1  0.0  0.91  0.7  1.0
  Si  Si15  1  0.24  0.3  0.6  1.0
  Si  Si16  1  0.24  0.48  0.6  1.0
  Si  Si17  1  0.33  0.89  0.55  1.0
  Si  Si18  1  0.23  0.0  0.49  1.0
  Si  Si19  1  0.33  0.19  0.43  1.0
  Si  Si20  1  0.33  0.59  0.43  1.0
  Si  Si21  1  0.57  0.89  0.29  1.0
  Si  Si22  1  0.57  0.98  0.33  1.0
  Si  Si23  1  0.57  0.8  0.33  1.0

What is the crystal system of this material?