To overlay Projection plots (simultaneously viewing multiple projection plot overlays with similar range on the same plot)
A different color will be used for each overlay, to allow one to differentiate between the overlays. A default legend showing the meaning of each overlay is shown on top-left side of the plot. This can be modified from inside the Plot Properties --> Advanced tab.
Example of overlaid Projection Plots is shown in the Figure below:
Overlaid Projection Plot
A zoomed in view of the plot above:
Overlaid Projection Plot (zoomed in)