It can also be used to plot data after an experiment, but the magnetometer and riometer data will not match the ionospheric data in that case.
Responses can be upper or lower case.
Usually start at the beginning of the experiment, record number 1, but use -1 if restarting the plot when the experiment has been running for some time in order to see the current data as soon as possible, any earlier data will be plotted as time, and the window, allow.