On the plot the boxes show the real time intervals of the two spacecraft magnetic conjugations on the background of the simulative geophysical regions in the position of the first of them.
The names of the both spacecraft are shown on the picture
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 first spacecraft position.
See the geophysical region designations and models.