A computer-implemented method for controlling a plurality of electromagnetic energy sources is disclosed. Instructions are executed on a processor to display on a computer-human interface display device a user interface region. The user interface region includes a pie-graph configured to display a total output power of the plurality of the electromagnetic energy sources. The pie-graph includes a radius that indicates the total output power and a plurality of sectors that indicate percentages of the total output power contributed by each of the plurality of the electromagnetic energy sources. An input is received via the user interface region, where the input is an interaction with the pie-graph that changes one of the radius or a sector of the plurality of the sectors. A power output of one or more of the electromagnetic energy sources is adjusted based on the input.