Distribution of the values of the median group cost function Stot using the 2MRS mock catalogues (in the left panel) and the SDSS mock gatalogues (in the right panel) for different values of αopt and Ropt. High values of Stot are indicated by dark red, while low values are indicated by dark blue. λopt is fixed to its optimal values, which is listed in Table 3. The green × denotes result of the optimal values of αopt and Ropt according to our simplex fit.
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