public void plot_on_graph_values(double dbt, double hr, double xval, double yval)
{
series1xx.ChartType = SeriesChartType.Point;
series1xx.Color = Color.FromArgb(0, 0, 255);//blue
series1xx.MarkerStyle = MarkerStyle.Circle;
series1xx.MarkerSize = 12;
string label = "DBT=" + dbt + ",HR=" + hr;
//chart1.Series["SeriesDBT_HR" + index].;
series1xx.Points.AddXY(xval, yval);
series1xx.Points[indexI++].Label = label;
//series1.Enabled = true;
}