How to do a X-Y scatter plot

[nitrogene]

Hello,

I am trying to insert a X-Y Scatter plot without success. Here's and example of used code:

...
insertColumn("totalLengthTheoretical-totalLengthReal", 7, totalLengthDiffValues, xlsxW);
{
    auto chart = xlsxW.insertChart(20, 9, QSize(300, 300));
    chart->setChartType(QXlsx::Chart::CT_ScatterChart);
    chart->addSeries(QXlsx::CellRange(QString("A1:A%1").arg(2+nbValues)));
    chart->addSeries(QXlsx::CellRange(QString("H1:H%1").arg(2+nbValues)));
    chart->setChartTitle("totalLength");
 }
...

But the output is not as expected:

How can I specify that first series are X values, and second series are Y values ?