I have been using TGraph2Ds to create plots in COLZ style where the significance is plotted on the z-axis.
Now I want to draw a line to separate between which points (x,y) are above a specific significance value (1.6) and which below.
What I thought was to get all the interpolated values of the z-axis and whenever that value is 1.6, to plot that point. Then I could connect these points with a line.
So, after inserting all the points I wanted with graph->SetPoint(npt,xval,yval,zval); I tried using the Interpolate function for random x and y, but it breaks.
Any ideas on how to proceed on this? Is my idea feasible?