QCustomPlot Discussion and Comments

Can anyone advise why this code will not put my third plot on the right hand axis. As it is, All three graphs are on the left hand y axis, the right hand title is printed, but no tick labels and ticks are based around the LH units.

Appologies if it is very poor, it is the first time I have tried programming in 10 years...

case 7://Obstacle avoidance

        ui->mainPlot->addGraph(ui->mainPlot->xAxis, ui->mainPlot->yAxis);
        ui->mainPlot->graph(0)->setPen(QPen(Qt::blue));
        ui->mainPlot->addGraph(ui->mainPlot->xAxis, ui->mainPlot->yAxis);
        ui->mainPlot->graph(1)->setPen(QPen(Qt::red));
        ui->mainPlot->addGraph(ui->mainPlot->xAxis, ui->mainPlot->yAxis2);// use RH axis
        ui->mainPlot->graph(2)->setPen(QPen(Qt::green));
        // read data from table
        for (int i=0; i<rows; ++i)
        {
            QModelIndex index = plotTableView->model()->index(i,EPOCH_DATE);
            x[i] = index.data().toDouble()/1000;
            index = plotTableView->model()->index(i,OBS_RANGE);
            //y0[i] = index.data().toDouble(); //use dummies in case of no data
            y0[i] = 20 * qCos((qreal)i / 300);
            index = plotTableView->model()->index(i,OBS_AMP);
            //y1[i] = index.data().toDouble();
            y1[i] = 3+ 15 * qCos((qreal)(i+75) / 300);
            index = plotTableView->model()->index(i, OBS_AZ);
            //y2[i] = index.data().toDouble();
            y2[i] = 120 * qCos((qreal)i / 300);
        }

        ui->mainPlot->yAxis->setLabel("(range - m / amplitude)");
        ui->mainPlot->yAxis->setRange(-5,50);
        ui->mainPlot->yAxis2->setLabel("(azimuth - deg)");
        ui->mainPlot->yAxis2->setVisible(true);
        ui->mainPlot->yAxis2->setTickLabels(true);
        ui->mainPlot->yAxis2->setLabelColor(Qt::green);
        ui->mainPlot->yAxis2->setRange(-150,150);

        ui->mainPlot->graph(0)->setData(x, y0);
        ui->mainPlot->graph(1)->setData(x, y1);
        ui->mainPlot->graph(2)->setData(x, y2);
        ui->mainPlot->graph(0)->setName(plotTableView->model()->headerData(OBS_RANGE, Qt::Horizontal).toString());
        ui->mainPlot->graph(1)->setName(plotTableView->model()->headerData(OBS_AMP, Qt::Horizontal).toString());
        ui->mainPlot->graph(2)->setName(plotTableView->model()->headerData(OBS_AZ, Qt::Horizontal).toString());

     break;

https://file.town/download/egzyas18ietk6k1xo6jku2c3f

cheers!