loop_
        _ma_angle_restraints.ordinal_id
        _ma_angle_restraints.restraint_id
        _ma_angle_restraints.entity_id_1
        _ma_angle_restraints.asym_id_1
        _ma_angle_restraints.seq_id_1
        _ma_angle_restraints.comp_id_1
        _ma_angle_restraints.atom_id_1
        _ma_angle_restraints.entity_id_2
        _ma_angle_restraints.asym_id_2
        _ma_angle_restraints.seq_id_2
        _ma_angle_restraints.comp_id_2
        _ma_angle_restraints.atom_id_2
        _ma_angle_restraints.entity_id_3
        _ma_angle_restraints.asym_id_3
        _ma_angle_restraints.seq_id_3
        _ma_angle_restraints.comp_id_3
        _ma_angle_restraints.atom_id_3
        _ma_angle_restraints.lower_limit
        _ma_angle_restraints.upper_limit
        _ma_angle_restraints.restraint_type
        _ma_angle_restraints.name
        1  2  1 A 21 ALA N  1 A 21 ALA CA  1 A 21 ALA  C  1 -60.0 -40.0  'upper and lower bound' .
        2  2  1 A 21 ALA C  1 A 22 THR  N  1 A 22 THR CA  1 -60.0 -40.0  'upper and lower bound' .
        3  2  1 A 23 LYS C  1 A 24 ASP  N  1 A 24 ASP CA  1 -60.0 -40.0  'upper and lower bound' .
        4  2  1 A 24 ASP N  1 A 24 ASP CA  1 A 24 ASP  C  1  90.0 120.0  'upper and lower bound' .
        5  2  1 A 15 GLY C  1 A 16 ASN  N  1 A 16 ASN CA  1 -60.0 -40.0  'upper and lower bound' .
        6  2  1 A 16 ASN N  1 A 16 ASN CA  1 A 16 ASN  C  1  90.0 120.0  'upper and lower bound' .
        7  2  1 A 16 ASN N  1 A 16 ASN CA  1 A 16 ASN  C  1 140.0 170.0  'upper and lower bound' .
        # ...  abbreviated ...