is there a chance to get in one window plot and the second derivative of the plot (stack)? Now by doing just second derivative I get separate window for derivative. It would be good to have residuals on the same window, too. Probably, I am talking about the window that one can get working with PFM: plot, second derivative and residuals. It would be nice to get all this data in normal window.
Make sure that only two graph windows are open in the workspace -- the original plot and the derivative plot -- then click the Merge button on the Graph toolbar (7th from left). When prompted, "keep the old graphs", then set Number of Rows to 2 and Number of Columns to 1 (or vice versa) and click OK twice. This should result in a two-panel graph.