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    $chart->add_series(
        categories    => xl_range_formula( 'Sheet1', 1, 9, 0, 0 ),
...
    );

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    $chart->add_series( categories => '=Sheet1!$A$2:$A$7'      ); # Sa
+me as ...
    $chart->add_series( categories => [ 'Sheet1', 1, 6, 0, 0 ] ); # Ze
+ro-indexed.