Solution space of the MOEA/D. First two rows: Pareto front for the crescent case using the EHT + ngEHT array. The first panel of the solution clusters (top-left corner) shows the true image. The Pareto front is a seven-dimensional hypersurface. We illustrate the Pareto front with six projections. The six projections show the correlation between two regularizers and their values with respect to f₇ (data fidelity term, only functional). The bluer the points are, the lower the value for f₇. Bottom two rows: solution clusters (following rows) for the crescent case using the EHT + ngEHT array. The family of solutions can be grouped into eight clusters. The red box surrounding the cluster indicates the preferred solution by the accumulation point strategy, while the blue box is the solution closest to the ideal.