How to use the igniteui-angular-charts/ES5/igx-polar-spline-series-component.IgxPolarSplineSeriesComponent function in igniteui-angular-charts

series2.radiusAxis = this.radiusAxis;
            series2.angleAxis = this.angleAxis;

            series1.areaFillOpacity = 0.3;
            series2.areaFillOpacity = 0.3;
            series1.markerType = MarkerType.Circle;
            series2.markerType = MarkerType.Circle;
            series1.title = "Boat Speed";
            series2.title = "Wind Speed";
            this.chart.series.clear();
            this.chart.series.add(series2);
            this.chart.series.add(series1);

        } else if (seriesType === "Spline") {
            // creating a series with mapping to data columns of wind pattern
            const series1 = new IgxPolarSplineSeriesComponent();
            series1.name = "series1";
            series1.angleMemberPath = "Direction";
            series1.radiusMemberPath  = "BoatSpeed";
            series1.radiusAxis = this.radiusAxis;
            series1.angleAxis = this.angleAxis;
            const series2 = new IgxPolarSplineSeriesComponent();
            series2.name = "series2";
            series2.angleMemberPath = "Direction";
            series2.radiusMemberPath  = "WindSpeed";
            series2.radiusAxis = this.radiusAxis;
            series2.angleAxis = this.angleAxis;

            series1.markerType = MarkerType.Circle;
            series2.markerType = MarkerType.Circle;
            series1.title = "Boat Speed";
            series2.title = "Wind Speed";

series2.markerType = MarkerType.Circle;
            series1.title = "Boat Speed";
            series2.title = "Wind Speed";
            this.chart.series.clear();
            this.chart.series.add(series2);
            this.chart.series.add(series1);

        } else if (seriesType === "Spline") {
            // creating a series with mapping to data columns of wind pattern
            const series1 = new IgxPolarSplineSeriesComponent();
            series1.name = "series1";
            series1.angleMemberPath = "Direction";
            series1.radiusMemberPath  = "BoatSpeed";
            series1.radiusAxis = this.radiusAxis;
            series1.angleAxis = this.angleAxis;
            const series2 = new IgxPolarSplineSeriesComponent();
            series2.name = "series2";
            series2.angleMemberPath = "Direction";
            series2.radiusMemberPath  = "WindSpeed";
            series2.radiusAxis = this.radiusAxis;
            series2.angleAxis = this.angleAxis;

            series1.markerType = MarkerType.Circle;
            series2.markerType = MarkerType.Circle;
            series1.title = "Boat Speed";
            series2.title = "Wind Speed";
            this.chart.series.clear();
            this.chart.series.add(series2);
            this.chart.series.add(series1);

        } else if (seriesType === "Line") {
            // creating a series with mapping to data columns of wind pattern