I simulated data with mean sin(4*x) and added Gaussian noise with standard deviation 0.25. The plots are produced in Matlab with some careful choice of markersize, linecolor, linewidth etc. Nothing special, but I sometimes take it too far in my effort for perfection (making sure that I have just the right space between the data points and the plot box ... and so on ...).
I would like to use something else than Matlab, but all the other high level languages that I know (R, Python, Julia) do not produce plot of the same quality (my opinion). I would like to as sold on ggplot2 as many other out there, but I am not (yet).