xxx
Array
(
    [0] => Array
        (
            [id] => 754
            [topology] => 4<sup>3</sup>T164
            [link_rcsr] => 
            [in_col] => 3
            [transitivity] => [3443]
            [space_group] => P213
            [pearson] => cP20
            [cn] => 4
            [Year] => 2016
            [cn_sort] => 004-
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            [caid] => 164
            [nn] => 0
            [name] => 
            [pressure] => 
            [density] => 3.347
            [e_gap] => 
            [energy] => 0.594
            [bulk_mod] => 400.8
            [shear_mod] => 405.2
            [vicker_hard] => 73.2
            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

    [1] => Array
        (
            [id] => 755
            [topology] => 4<sup>3</sup>T164
            [link_rcsr] => 
            [in_col] => 3
            [transitivity] => [3443]
            [space_group] => P213
            [pearson] => cP20
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            [cn_sort] => 004-
            [topology_str] => 4<sup>3</sup>T164
            [caid] => 164
            [nn] => 1
            [name] => C<sub>20</sub>-T
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            [e_gap] => 5.44
            [energy] => 
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            [shear_mod] => 427
            [vicker_hard] => 72.76
            [ref_file] => /References/2016_JPhysCondMat_28_475402
            [publ_year] => 2016
            [ref] => 
        )

)
xxx