Cumulative comb-response obtained as the sum of the individual comb-responses for each central frequency ν₀ with amplitude  >0.5 m s^-1 (S/N ≳ 3.5) in the amplitude spectrum. The maximum peak is centered at Δν = 28.90    ±    0.45   μHz where the uncertainty is evaluated as the FWHM of the Gaussian used to fit the peak (blue dot-dashed curve). The second marked peak on the right, centered at 34.71   μHz, represents three times the daily spacing.