Bart asked via email, "One thing that is not working for us is the reverse X-axis plot. If we do descending x-values, the plot works fine, but the X-Axis is missing, blank and we cannot find a way to display it. Is there a trick to make it work?"

Unfortunately ScottPlot isn't really built to do this well. A round-about way I could support this is to have the user plot data in the negative space, then use a flag to invert the sign of the labels.