xxx
Array
(
    [0] => Array
        (
            [id] => 1019
            [topology] => 4<sup>5</sup>T15
            [link_rcsr] => 
            [in_col] => 5
            [transitivity] => [5753]
            [space_group] => I-4
            [pearson] => tI28
            [cn] => 4
            [Year] => 2013
            [cn_sort] => 004-
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            [caid] => 238
            [nn] => 0
            [name] => 
            [pressure] => 
            [density] => 3.308
            [e_gap] => 
            [energy] => 0.739
            [bulk_mod] => 408.3
            [shear_mod] => 419.4
            [vicker_hard] => 76.3
            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

    [1] => Array
        (
            [id] => 1020
            [topology] => 4<sup>5</sup>T15
            [link_rcsr] => 
            [in_col] => 5
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            [space_group] => I-4
            [pearson] => tI28
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            [cn_sort] => 004-
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            [caid] => 238
            [nn] => 1
            [name] => I-4
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            [density] => 3.262
            [e_gap] => 
            [energy] => 
            [bulk_mod] => 
            [shear_mod] => 
            [vicker_hard] => 83.0
            [ref_file] => /References/2013_JChemPhys_138_114101
            [publ_year] => 2013
            [ref] => 
        )

    [2] => Array
        (
            [id] => 1021
            [topology] => 4<sup>5</sup>T15
            [link_rcsr] => 
            [in_col] => 5
            [transitivity] => [5753]
            [space_group] => I-4
            [pearson] => tI28
            [cn] => 4
            [Year] => 2013
            [cn_sort] => 004-
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            [caid] => 238
            [nn] => 2
            [name] => I-4-carbon
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            [e_gap] => 5.19
            [energy] => 
            [bulk_mod] => 393
            [shear_mod] => 421
            [vicker_hard] => 55.5
            [ref_file] => /References/2016_Materials_09_484
            [publ_year] => 2016
            [ref] => 
        )

)
xxx