Core dictionary (coreCIF) version 2.4.5
'_cell_length_a' '_cell_length_b' '_cell_length_c'
Unit-cell lengths in angstroms corresponding to the structure reported. The values of _refln_index_h, *_k, *_l must correspond to the cell defined by these values and _cell_angle_ values. The values of _diffrn_refln_index_h, *_k, *_l may not correspond to these values if a cell transformation took place following the measurement of the diffraction intensities. See also _diffrn_reflns_transf_matrix_.
The permitted range is 0.0 -> infinity