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Estimated coefficient maps separated by signal-to-noise ratios, choices of tuning parameters. The first row corresponds to the case when signal-to-noise ratio is 10 while the second row corresponds to the case when the ratio is 1. The first column shows the estimates when the optimal tuning parameters are used. For the second and third columns, we used two sets of randomly-picked tuning parameters whose CV score are at most 40% higher than the optimal value.
