A statistical analysis of radial (line-of-sight) distributions of brightest galaxy clusters (BCGs) within a redshift interval 0.044 ≤ z ≤ 0.78 and Mg II absorption-line systems (0.37 ≤ z ≤ 2.28) is carried out. Power spectra and two-point radial correlation functions are calculated. It is found that both the radial distributions of spectroscopic redshifts of 52,683 BCGs and 32,840 Mg II absorption-line systems incorporate similar quasi-periodical components relatively to the comoving distance. For the ΛCDM cosmological model the periodicities correspond to spatial comoving scales (98 ± 3) and (101 ± 2) h⁻¹ Mpc, respectively. These quasi-periods turn out to be close to the characteristic scale (101 ± 6) h⁻¹ Mpc of quasi-periodical component obtained earlier for the radial distribution of the Luminous Red Galaxies (LRGs). On the other hand, the scales are close to the spatial scale of baryon acoustic oscillations (BAOs) revealed by many authors at the last decade. Fourier transform phases obtained for BCGs and LRGs are found to be close, while the phases calculated for Mg II absorption systems and LRGs are opposite. Discussions of the results in a context of the BAO and Large-Scale Structure characteristic scales are outlined.

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