Fig. 2.

Examples of near optimal angular quadratures of order L = 13. Left panel: S0 quadrature with a total of 100 independent rays. Central panel: S2 quadrature with 8 independent rays and 120 rays in total. Right panel: S3 quadrature with 5 independent rays and 168 rays in total. We note that although only one octant is shown, the independent rays in the left panel are distributed over the whole sphere. The blue points indicate the generating nodes while the red points are on their orbits.
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