The power sum coverage map shows the received power in [dBm] as sum, i.e., not taking the phase shift into account, of the contributions of the different ray-paths for all receivers within the area or region and for the selected transmitter. Example of a power sum coverage map (without thresholds):
More information and the possibility to update or export the map can be accessed through the [Update] menu entry of the window, which presents, for instance, a dialog like:
The threshold values provide a mean to color the map with only four colors, where the actual color depends whether a certain receiver point reaches at most the threshold as power value.
For a receiver of type trajectory, the power sum can be visualized as a power sum variation.