#
#some more code
#
$chartsheet=$workbook2->add_worksheet('Chart');
$chart=$workbook2->add_chart(type=>'line', embedded=>1);
$chart->set_plotarea(weight=>'none');
$chart->add_series(
    categories=>xl_range_formula('series1',1,$row_max,1,1),
    values=>xl_range_formula('series1',1,$row_max,3,3),
    name=>'series1'
    );
$chart->set_y_axis(name=>'Y-axis1');
$chart->add_series(
    categories=>xl_range_formula('series2',1,$row_max,1,1),
    values=>xl_range_formula('series2',1,$row_max,5,5),
    name=>'series2'
    );
$chart->set_y_axis(name=>'Y-axis2');
$chart->set_x_axis(name=>'X-axis');
$chartsheet->insert_chart(0,0,$chart,0,0,1,1);