xxx
Array
(
    [0] => Array
        (
            [id] => 1629
            [topology] => 4<sup>14</sup>T5
            [link_rcsr] => 
            [in_col] => 14
            [transitivity] => [(14)(28)(29)(15)]
            [space_group] => P1
            [pearson] => aP14
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            [topology_str] => 4<sup>14</sup>T5
            [caid] => 503
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            [name] => 
            [pressure] => 
            [density] => 3.448
            [e_gap] => 
            [energy] => 1.026
            [bulk_mod] => 381.9
            [shear_mod] => 433.6
            [vicker_hard] => 81.5
            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

    [1] => Array
        (
            [id] => 1630
            [topology] => 4<sup>14</sup>T5
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            [transitivity] => [(14)(28)(29)(15)]
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            [cn_sort] => 004-
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            [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