Select Code to Download

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

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