Distribution of the total GW abundance in the seventh NG15 frequency bin for the best-fit eccentricity model found in Sect. 7. The green (orange) curve shows the distribution obtained using the no-correlation (with correlations) method with 10⁵ (10⁴) realisations. The thick black dashed curve shows the analytical estimate of the long tail of the distribution of individual binaries. The dashed and dot-dashed curves show the contributions from strong and weak sources respectively.