On the plot the simulative geophysical regions in the spacecraft positions are shown as a function of the UT.
Date is shown along the X-axis, the UT - along the Y-axis.

The time (with 20-min step) is labelled by the symbol, corresponding to the geophysical region in the spacecraft position.
The orbit crossections with the simulative magnetopause are shown as well, by the "diamond" symbol.

On the FSP plots the different colours are used for each of the 4 spacecraft. In this case the SC names are shown by the corresponding colours.