_computing.data_collection         'CAD-4 (Enraf-Nonius, 1989)'
    _computing.cell_refinement         'CAD-4 (Enraf-Nonius, 1989)'
    _computing.data_reduction          'CFEO (Solans, 1978)'
    _computing.structure_solution      'SHELXS86 (Sheldrick, 1990)'
    _computing.structure_refinement    'SHELXL93 (Sheldrick, 1993)'
    _computing.molecular_graphics      'ORTEPII (Johnson, 1976)'
    _computing.publication_material    'PARST (Nardelli, 1983)'
       
    _computing.data_collection             'DENZO'
    _computing.data_reduction              'SCALEPACK'
    _computing.structure_solution          'PHASES'
    _computing.structure_refinement        'NUCLSQ'
    ;