Upper panel - Power distribution of all of the Σ values obtained in the analysis of the 1349 - 1450 Hz interval for dataset D2 (see Sect. 7). The histogram was renormalized to the number of Σ values considered, i.e., the 51712 × 695 × 45 templates (over the f, a_⊥, and T_asc dimensions). The dashed line is the expected ${\chi }_{2M}^2$ probability density function in the case of noise alone. Lower panel - Distributions of the maximum values of Σ over subsets of our parameter space. The blue histogram was obtained by taking non-overlapping blocks of close templates, with block sizes equal to 128, 3, and 5 points in the f, a_⊥, and T_asc dimensions, respectively; the orange histogram was obtained in the same way, but after randomly shuffling the position of all points in our space. Both histograms were renormalized to the number of subsets, 842 340. The dashed line is the expected n-trials-corrected ${\chi }_{2M}^2$ probability density function (Eq. C.2).