Qchart Remove The Line Point From Bottom

I am new in QT, I want to build a chart. In the chart, i want to show only line. You can see the picture with is attached. How can i remove this point?1 Thank you.

you should hide legends.

    chart->legend()->hide();

For example :

    QChart *chart = new QChart();
    chart->addSeries(series);
    chart->setTitle("Simple areachart example");
    chart->createDefaultAxes();
    chart->axes(Qt::Horizontal).first()->setRange(0, 20);
    chart->axes(Qt::Vertical).first()->setRange(0, 10);

    chart->legend()->hide();

    QChartView *chartView = new QChartView(chart);
    chartView->setRenderHint(QPainter::Antialiasing);

you can see what happens from this picture:

    before                                                after

I use this Qt Example