Example grid of possible feed group (FG1–4) and elevation (high and low) split combinations. Combinations with dark and light gray shading, respectively, represent auto-feed group and auto-elevation combinations that are not used in the final averaged FGPXS. The crosscombinations containing examples of a 2D cross-spectrum contribute to the final average FGPXS as neither identical feed groups, nor elevations, are crossed.