Как убрать подписи данных к точкам на графиках phpword?

Есть график сделанный в phpword. Как можно убрать подписи к точка на графике?

$testSeries = [461,643,778,693,709,816,1049,687,722,769,715,756,638,717,921,1098,1412,1111,760,662,658,671,873,624,617,647,675,534,577,725];
$testCats = ["10.06","09.06","08.06","07.06","06.06","05.06","04.06","03.06","02.06","01.06","31.05","30.05","29.05","28.05","27.05","26.05","25.05","24.05","23.05","22.05","21.05","20.05","19.05","18.05","17.05","16.05","15.05","14.05","13.05","12.05"];

$section->addTitle(ucfirst('line'), 2);
$chart = $section->addChart('line', $testCats, $testSeries);