Array
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            [name] => 
            [pressure] => 
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            [shear_mod] => 476.5
            [vicker_hard] => 89.8
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            [publ_year] => 
            [ref] => 
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        (
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            [vicker_hard] => 78.85
            [ref_file] => /References/M585_carbon_lower_than_H
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    [2] => Array
        (
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    [3] => Array
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            [ref] => 
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)