Gnuplot Produced by GNUPLOT 5.4 patchlevel 0 0 10 20 30 40 50 60 70 80 90 0 2 4 6 8 10 12 14 16 18 20 Total sample time (ms) Iterations (x 103) Sample Sample Linear regression Linear regression Confidence interval Confidence interval nth_element/kth/1000