Gnuplot Produced by GNUPLOT 5.3 patchlevel 0 0 20 40 60 80 100 120 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 Total sample time (ms) Iterations (x 103) sort/Unstable/100000 Sample Sample Linear regression Linear regression Confidence interval Confidence interval