xxx
Array
(
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        (
            [id] => 1589
            [topology] => 4<sup>6</sup>T41
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            [shear_mod] => 367.7
            [vicker_hard] => 66.2
            [ref_file] => 
            [publ_year] => 
            [ref] => 
        )

    [1] => Array
        (
            [id] => 1590
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            [ref] => 
        )

)
xxx