<|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_BaAl4Se7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.73
_cell_length_b   6.63
_cell_length_c   14.93
_cell_angle_alpha   90.0
_cell_angle_beta   121.01
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   BaAl4Se7
_chemical_formula_sum   'Ba2 Al8 Se14'
_cell_volume   654.99
_cell_formula_units_Z   2
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
  Ba  Ba8  1  0.88  0.66  0.79  1.0
  Ba  Ba9  1  0.04  0.96  0.19  1.0
  Al  Al0  1  0.67  0.26  0.29  1.0
  Al  Al1  1  0.83  0.31  0.49  1.0
  Al  Al2  1  0.78  0.76  0.54  1.0
  Al  Al3  1  0.9  0.44  0.34  1.0
  Al  Al4  1  0.82  0.37  0.69  1.0
  Al  Al5  1  0.98  0.32  0.89  1.0
  Al  Al6  1  0.93  0.87  0.93  1.0
  Al  Al7  1  0.05  0.19  0.74  1.0
  Se  Se10  1  0.56  0.11  0.27  1.0
  Se  Se11  1  0.92  0.47  0.44  1.0
  Se  Se12  1  0.72  0.49  0.47  1.0
  Se  Se13  1  0.64  0.01  0.91  1.0
  Se  Se14  1  0.22  0.36  0.66  1.0
  Se  Se15  1  0.69  0.69  0.83  1.0
  Se  Se16  1  0.47  0.76  0.88  1.0
  Se  Se17  1  0.72  0.51  0.67  1.0
  Se  Se18  1  0.07  0.16  0.84  1.0
  Se  Se19  1  0.87  0.14  0.87  1.0
  Se  Se20  1  0.79  0.62  0.31  1.0
  Se  Se21  1  0.38  0.27  0.06  1.0
  Se  Se22  1  0.84  0.94  0.23  1.0
  Se  Se23  1  0.62  0.87  0.28  1.0

What is the crystal system of this material?<|im_end|>
<|im_start|>assistant
Given the following CIF representation:
data_BaAl4Se7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   7.73
_cell_length_b   6.63
_cell_length_c   14.93
_cell_angle_alpha   90.0
_cell_angle_beta   121.01
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   BaAl4Se7
_chemical_formula_sum   'Ba2 Al8 Se14'
_cell_volume   654.99
_cell_formula_units_Z   2
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
  Ba  Ba8  1  0.88  0.66  0.79  1.0
  Ba  Ba9  1  0.04  0.96  0.19  1.0
  Al  Al0  1  0.67  0.26  0.29  1.0
  Al  Al1  1  0.83  0.31  0.49  1.0
  Al  Al2  1  0.78  0.76  0.54  1.0
  Al  Al3  1  0.9  0.44  0.34  1.0
  Al  Al4  1  0.82  0.37  0.69  1.0
  Al  Al5  1  0.98  0.32  0.89  1.0
  Al  Al6  1  0.93  0.87  0.93  1.0
  Al  Al7  1  0.05  0.19  0.74  1.0
  Se  Se10  1  0.56  0.11  0.27  1.0
  Se  Se11  1  0.92  0.47  0.44  1.0
  Se  Se12  1  0.72  0.49  0.47  1.0
  Se  Se13  1  0.64  0.01  0.91  1.0
  Se  Se14  1  0.22  0.36  0.66  1.0
  Se  Se15  1  0.69  0.69  0.83  1.0
  Se  Se16  1  0.47  0.76  0.88  1.0
  Se  Se17  1  0.72  0.51  0.67  1.0
  Se  Se18  1  0.07  0.16  0.84  1.0
  Se  Se19  1  0.87  0.14  0.87  1.0
  Se  Se20  1  0.79  0.62  0.31  1.0
  Se  Se21  1  0.38  0.27  0.06  1.0
  Se  Se22  1  0.84  0.94  0.23  1.0
  Se  Se23  1  0.62  0.87  0.28  1.0

What is the crystal system of this material?