xxx
Array
(
    [0] => Array
        (
            [id] => 1577
            [topology] => 4<sup>12</sup>T6
            [link_rcsr] => 
            [in_col] => 12
            [transitivity] => [(12)(24)(15)3]
            [space_group] => P1
            [pearson] => aP12
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            [topology_str] => 4<sup>12</sup>T6
            [caid] => 477
            [nn] => 0
            [name] => 
            [pressure] => 
            [density] => 3.325
            [e_gap] => 
            [energy] => 1.140
            [bulk_mod] => 372.0
            [shear_mod] => 385.1
            [vicker_hard] => 70.3
            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

    [1] => Array
        (
            [id] => 1578
            [topology] => 4<sup>12</sup>T6
            [link_rcsr] => 
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            [transitivity] => [(12)(24)(15)3]
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            [cn_sort] => 004-
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            [caid] => 477
            [nn] => 1
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            [density] => 
            [e_gap] => 
            [energy] => 
            [bulk_mod] => 
            [shear_mod] => 
            [vicker_hard] => 
            [ref_file] => /References/2017_ChemPhysChem_18_873
            [publ_year] => 2017
            [ref] => 
        )

)
xxx