xxx
Array
(
    [0] => Array
        (
            [id] => 805
            [topology] => 3,4<sup>2</sup>T242
            [link_rcsr] => 
            [in_col] => 3
            [transitivity] => [3566]
            [space_group] => P4/mbm
            [pearson] => tP20
            [cn] => 3, 4 (1:4)
            [Year] => 2016
            [cn_sort] => 003-004-001-004-
            [topology_str] => 3,4<sup>2</sup>T242
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            [name] => 
            [pressure] => 
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            [e_gap] => 
            [energy] => 0.540
            [bulk_mod] => 327.6
            [shear_mod] => 295.9
            [vicker_hard] => 49.1
            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

    [1] => Array
        (
            [id] => 806
            [topology] => 3,4<sup>2</sup>T242
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            [in_col] => 3
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            [pearson] => tP20
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            [Year] => 2016
            [cn_sort] => 003-004-001-004-
            [topology_str] => 3,4<sup>2</sup>T242
            [caid] => 177
            [nn] => 1
            [name] => C<sub>20</sub>-D
            [pressure] => 
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            [energy] => 
            [bulk_mod] => 
            [shear_mod] => 
            [vicker_hard] => 
            [ref_file] => /References/2016_Carbon_109_246
            [publ_year] => 2016
            [ref] => 
        )

)
xxx