The allowed range of ℓ/a and ζ for a range of values of (τ/P)_min as derived using Eq. (15). The ranges exist to the left of each curve as illustrated with the shaded area for (τ/P)_min = 0.65. The thick curve represents the value of ζ_max as a function of (ℓ/a)_max that fits best the observed quality factor distribution. A uniform distribution in ζ has been assumed. The use of a Jeffrey’s distribution instead would yield an almost identical curve. The dot indicates the values of (ℓ/a)_max and ζ_max for the fit with the smallest χ².