how can I prevent dashed line to become continuous line?

Hi everyone, I am interested in plotting a dashed line. However, due to the large data points that I have in a plot, some part becomes dashed line and some continuous line. How can I solve this problem?I attached you the plot.

Answer 1

[Walter Roberson]

You would have to filter your data to use fewer points.

For example you might do a spline fit on the data and then interpolate the spline at fewer points.