This kind of relation has also been proposed for the quark families, with phases equal to low-energy values ⁠ 2 / 27 ⁠ = ⁠ 2 / 9 ⁠ × ⁠ 1 / 3 ⁠ and ⁠ 4 / 27 ⁠ = ⁠ 2 / 9 ⁠ × ⁠ 2 / 3 ⁠, hinting at a relation with the charge of the particle family (⁠ 1 / 3 ⁠ and ⁠ 2 / 3 ⁠ for quarks vs. ⁠ 3 / 3 ⁠ = 1 for the leptons, where ⁠ 1 / 3 ⁠ × ⁠ 2 / 3 ⁠ × ⁠ 3 / 3 ⁠ ≈ δ ).