xxx
Array
(
    [0] => Array
        (
            [id] => 677
            [topology] => 4<sup>2</sup>T257
            [link_rcsr] => 
            [in_col] => 2
            [transitivity] => [2773]
            [space_group] => P6/mcc
            [pearson] => hP48
            [cn] => 4
            [Year] => 2016
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            [caid] => 145
            [nn] => 0
            [name] => 
            [pressure] => 
            [density] => 2.899
            [e_gap] => 
            [energy] => 0.589
            [bulk_mod] => 317.5
            [shear_mod] => 254.9
            [vicker_hard] => 36.1
            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

    [1] => Array
        (
            [id] => 678
            [topology] => 4<sup>2</sup>T257
            [link_rcsr] => 
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            [space_group] => P6/mcc
            [pearson] => hP48
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            [Year] => 2016
            [cn_sort] => 004-
            [topology_str] => 4<sup>2</sup>T257
            [caid] => 145
            [nn] => 1
            [name] => 3060-carbon
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            [energy] => 
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            [shear_mod] => 259
            [vicker_hard] => 39
            [ref_file] => /References/2016_AIP_advances_6_065225
            [publ_year] => 2016
            [ref] => 
        )

)
xxx